Best Running Watch, including Garmin, Polar, & Suunto

From Fellrnr.com, Running tips
Jump to: navigation, search

This article is a concise guide to the best running watches available today at differing prices and functionality. As well as recommendations for the best watch, I also have a few that are worth considering in spite of their flaws, and some to avoid.

  • The Garmin Epix has the most features, though its GPS accuracy lets it down a little. It has full color maps for navigation, something that's great when running in a strange town or out in the wilderness. It supports the Connect IQ downloadable apps to make it extensible.
  • The Garmin 920XT can be thought of as a cut down version of the Epix, with slightly better GPS Accuracy, but lacking some of the other features (mainly the color map).
  • The Garmin 310XT is the best value for money and has all the features you're likely to need. (The Garmin 910XT has more features, but tends to be a little more pricy.)
  • If the 310XT is too big and you want something more watch like, then the Garmin 610 is great, and it's often available refurbished at a great price.
  • The Suunto Ambit2 and Suunto Ambit3 are both great watches, with excellent GPS Accuracy. For most runners the cheapest of the range (Ambit 2 R/Ambit 3 Run) are the best choice, but for ultrarunners the extra battery life of the (Ambit 2/Ambit 3 Peak) may be worthwhile.
  • The Garmin 620 has a lovely usability, but it's more expensive than the 610 and you can't get your current Pace From A Footpod.
  • For GPS Accuracy, the Polar V800 is the best, but it falls short in many other areas.
  • Several watches use Optical Heart Rate Monitoring, but I've not found any of them accurate enough for real world use.
  • Consider using a Smartphone; if you already have one they are a cheap option and can have outstanding GPS Accuracy.

1 Comparison

Here's a table of these features for each of the watches I recommend (all have GPS). I evaluate running watches in three distinct ways. Firstly, you can use a watch on its own, without any kind of Footpod. This is probably the most common way runners use their watch, but you miss out on a lot. The second rating is with a standard Footpod that is available quite cheaply. These Footpod's can be reasonably accurate once the calibrated, but calibration is a little tedious. The final evaluation is with the Stryd Footpod, which is vastly more accurate than any other type of Footpod, or and more accurate than GPS. The table below looks at the score, and the value for money of each watch for each of the three conditions.

Review With Stryd Score With Stryd Value for money With Footpod Score With Footpod Value for money Without Footpod Score Without Footpod Value for money Price at Amazon.com
Garmin Epix Review 47 4.5 31 3.9 23 3.4 Garmin Epix $365.66 USD at Amazon.com
(Referbished $189.95)
Garmin Fenix 5X Review 47 2.9 31 2.3 23 1.8 Garmin Fenix 5X Review
Garmin Fenix 3 Review 45 3.8 28 3.1 24 3 Fenix 3 $449.99 USD at Amazon.com
(Referbished $299.95)
Garmin Vivoactive HR Review 40 4.9 21 3.8 17 3.8 Garmin Vivoactive HR $. at Amazon.com
(Referbished $144.95)
Garmin 920XT Review 39 4.4 30 4.7 24 4.5 Garmin 920XT without HRM $259.99 USD at Amazon.com
(Referbished $289.00)
Garmin Vivoactive Review 34 5.1 14 3.4 10 3.3 Garmin Vivoactive $159.99 USD at Amazon.com
(Referbished $99.00)
Suunto Ambit2 Review 32 3.9 25 4.3 21 4.5 Suunto Ambit2 $289.99 USD (new) at Amazon.com
Suunto Ambit3 Peak Review 32 3.4 29 4.1 25 4.2 Suunto Ambit3 Peak $339.20 USD at Amazon.com
Suunto Ambit3 Run Review 30 4 27 5.5 23 5.9 Suunto Ambit3 Run $. (new) at Amazon.com
Suunto Ambit2 R Review 30 3.5 23 3.8 19 3.8 Suunto Ambit2 R without HRM $249.00 USD at Amazon.com
Garmin 235 Review 28 2.9 20 2.8 12 2 Garmin 235 $327.99 USD (new) at Amazon.com
(Referbished $349.98)
Garmin 620 Review 27 3.8 24 5.1 20 5.6 Garmin 620 without HRM price not listed at Amazon.com
Garmin 910XT Review 26 3.9 26 6.1 21 6.7 Garmin 910XT without HRM price not listed at Amazon.com
Garmin Fenix 2 Review 26 2.4 22 2.7 18 2.5 Garmin Fenix 2 without HRM price not listed at Amazon.com
Suunto Spartan Ultra Review 26 1.8 28 2.4 24 2.2 Suunto Spartan Ultra $528.56 USD at Amazon.com
Garmin 310XT Review 25 4.6 24 8.3 18 10 Garmin 310XT without HRM
price not listed at Amazon.com
Garmin 225 Review 25 3.8 13 3.1 9 2.9 Garmin 225 $119.32 USD (used) at Amazon.com
(Referbished $144.95)
TomTom Cardio Runner Review 25 3.3 14 2.8 10 2.5 TomTom Cardio Runner price not listed at Amazon.com
Polar V800 Review 25 2.1 26 2.8 22 2.7 Polar V800 without HRM $449.95 USD (new) at Amazon.com
Polar M400 Review 24 4.1 14 4.2 10 4.4 Polar M400 without HRM $126.59 USD at Amazon.com
(Referbished $99.99)
Garmin 610 Review 24 3.3 20 4.3 14 3.9 Garmin 610 without HRM price not listed at Amazon.com
Leikr Review 10 1 20 2.5 14 2 Leikr ($380)
Epson SF-510 Review 4 0.7 4 1.3 4 2 Epson SF-510 $88.95 USD at Amazon.com
Epson SF-810 Review 4 0.6 6 1.6 6 2.3 Epson SF-810 $119.99 USD at Amazon.com
Garmin 10 Review 2 0.3 2 0.6 2 0.9 Garmin 10 $89.99 USD at Amazon.com
(Referbished $45.33)

The score is the sum of how well each watch can answer the four basic questions (how far, how fast, where are you, what's your cadence), plus some bonus points.

  1. The "How far you've run" will be based on GPS only for "without Footpod" and "with Standard Footpod", but based on Stryd if supported in the "with Stryd Footpod" table..
  2. How fast you're running assumes you're using a Footpod if it's supported, otherwise the rating is 0-2 based on GPS accuracy.
  3. The "Where are you?" is based on various navigation features such as back to start, breadcrumbs, and preloaded maps. For some watches, you have to turn GPS off to get the benefit of Stryd, so those watches have worse "where are you scores" with Stryd than without.
  4. The cadence score uses 1 point for an internal cadence sensor, 2 points for footpod support, 1 point for support from chest strap cadence, and 1 point for cadence alerts.
  5. I give 1-2 bonus points for application support, 1-2 bonus points for data upload, 1-2 bonus points for Optical Heart Rate Monitoring, and 0-1 bonus points for battery life.
  6. Value for money is the score divided by the price (at the time I last updated the table.) Your needs may be different, so you might weight the different aspects of the watches differently, or be basing your decision on different criteria totally. Hopefully this table will give you a good starting point for your decision.

2 Score Breakdown without a Footpod

Review Score Value for money6 How far did
you run?1
How fast are
you running?2
Where are
you?3
What's your
cadence?4
Bonus Points5

Price at Amazon.com

Suunto Ambit3 Peak Review 25 4.2 8 3 6 2 6 Suunto Ambit3 Peak $339.20 USD at Amazon.com
Garmin 920XT Review 24 4.5 1 2 7 6 8 Garmin 920XT without HRM $259.99 USD at Amazon.com
(Referbished $289.00)
Garmin Fenix 3 Review 24 3 2 1 7 6 8 Fenix 3 $449.99 USD at Amazon.com
(Referbished $299.95)
Suunto Spartan Ultra Review 24 2.2 8 2 7 2 5 Suunto Spartan Ultra $528.56 USD at Amazon.com
Suunto Ambit3 Run Review 23 5.9 8 3 5 2 5 Suunto Ambit3 Run $. (new) at Amazon.com
Garmin Epix Review 23 3.4 0 0 9 6 8 Garmin Epix $365.66 USD at Amazon.com
(Referbished $189.95)
Garmin Fenix 5X Review 23 1.8 0 0 9 6 8 Garmin Fenix 5X Review
Polar V800 Review 22 2.7 9 4 3 2 4 Polar V800 without HRM $449.95 USD (new) at Amazon.com
Garmin 910XT Review 21 6.7 5 3 6 2 5 Garmin 910XT without HRM price not listed at Amazon.com
Suunto Ambit2 Review 21 4.5 4 3 6 2 6 Suunto Ambit2 $289.99 USD (new) at Amazon.com
Garmin 620 Review 20 5.6 3 2 2 6 7 Garmin 620 without HRM price not listed at Amazon.com
Suunto Ambit2 R Review 19 3.8 4 3 5 2 5 Suunto Ambit2 R without HRM $249.00 USD at Amazon.com
Garmin 310XT Review 18 10 7 2 4 0 5 Garmin 310XT without HRM
price not listed at Amazon.com
Garmin Fenix 2 Review 18 2.5 1 0 6 6 5 Garmin Fenix 2 without HRM price not listed at Amazon.com
Garmin Vivoactive HR Review 17 3.8 0 0 2 6 9 Garmin Vivoactive HR $. at Amazon.com
(Referbished $144.95)
Garmin 610 Review 14 3.9 3 2 3 2 4 Garmin 610 without HRM price not listed at Amazon.com
Leikr Review 14 2 5 2 4 0 3 Leikr ($380)
Garmin 235 Review 12 2 0 0 2 2 8 Garmin 235 $327.99 USD (new) at Amazon.com
(Referbished $349.98)
Polar M400 Review 10 4.4 3 1 1 2 3 Polar M400 without HRM $126.59 USD at Amazon.com
(Referbished $99.99)
Garmin Vivoactive Review 10 3.3 0 0 0 6 4 Garmin Vivoactive $159.99 USD at Amazon.com
(Referbished $99.00)
TomTom Cardio Runner Review 10 2.5 2 1 0 2 5 TomTom Cardio Runner price not listed at Amazon.com
Garmin 225 Review 9 2.9 1 1 0 2 5 Garmin 225 $119.32 USD (used) at Amazon.com
(Referbished $144.95)
Epson SF-810 Review 6 2.3 1 0 0 2 3 Epson SF-810 $119.99 USD at Amazon.com
Epson SF-510 Review 4 2 0 0 0 0 4 Epson SF-510 $88.95 USD at Amazon.com
Garmin 10 Review 2 0.9 0 0 0 0 2 Garmin 10 $89.99 USD at Amazon.com
(Referbished $45.33)

3 Score Breakdown with a Standard Footpod

Review Score Value for money6 How far did
you run?1
How fast are
you running?2
Where are
you?3
What's your
cadence?4
Bonus Points5

Price at Amazon.com

Garmin Epix Review 31 3.9 0 4 9 10 8 Garmin Epix $365.66 USD at Amazon.com
(Referbished $189.95)
Garmin Fenix 5X Review 31 2.3 0 4 9 10 8 Garmin Fenix 5X Review
Garmin 920XT Review 30 4.7 1 4 7 10 8 Garmin 920XT without HRM $259.99 USD at Amazon.com
(Referbished $289.00)
Suunto Ambit3 Peak Review 29 4.1 8 3 6 6 6 Suunto Ambit3 Peak $339.20 USD at Amazon.com
Garmin Fenix 3 Review 28 3.1 2 1 7 10 8 Fenix 3 $449.99 USD at Amazon.com
(Referbished $299.95)
Suunto Spartan Ultra Review 28 2.4 8 2 7 6 5 Suunto Spartan Ultra $528.56 USD at Amazon.com
Suunto Ambit3 Run Review 27 5.5 8 3 5 6 5 Suunto Ambit3 Run $. (new) at Amazon.com
Garmin 910XT Review 26 6.1 5 4 6 6 5 Garmin 910XT without HRM price not listed at Amazon.com
Polar V800 Review 26 2.8 9 4 3 6 4 Polar V800 without HRM $449.95 USD (new) at Amazon.com
Suunto Ambit2 Review 25 4.3 4 3 6 6 6 Suunto Ambit2 $289.99 USD (new) at Amazon.com
Garmin 310XT Review 24 8.3 7 4 4 4 5 Garmin 310XT without HRM
price not listed at Amazon.com
Garmin 620 Review 24 5.1 3 2 2 10 7 Garmin 620 without HRM price not listed at Amazon.com
Suunto Ambit2 R Review 23 3.8 4 3 5 6 5 Suunto Ambit2 R without HRM $249.00 USD at Amazon.com
Garmin Fenix 2 Review 22 2.7 1 0 6 10 5 Garmin Fenix 2 without HRM price not listed at Amazon.com
Garmin Vivoactive HR Review 21 3.8 0 0 2 10 9 Garmin Vivoactive HR $. at Amazon.com
(Referbished $144.95)
Garmin 610 Review 20 4.3 3 4 3 6 4 Garmin 610 without HRM price not listed at Amazon.com
Garmin 235 Review 20 2.8 0 4 2 6 8 Garmin 235 $327.99 USD (new) at Amazon.com
(Referbished $349.98)
Leikr Review 20 2.5 5 4 4 4 3 Leikr ($380)
Polar M400 Review 14 4.2 3 1 1 6 3 Polar M400 without HRM $126.59 USD at Amazon.com
(Referbished $99.99)
Garmin Vivoactive Review 14 3.4 0 0 0 10 4 Garmin Vivoactive $159.99 USD at Amazon.com
(Referbished $99.00)
TomTom Cardio Runner Review 14 2.8 2 1 0 6 5 TomTom Cardio Runner price not listed at Amazon.com
Garmin 225 Review 13 3.1 1 1 0 6 5 Garmin 225 $119.32 USD (used) at Amazon.com
(Referbished $144.95)
Epson SF-810 Review 6 1.6 1 0 0 2 3 Epson SF-810 $119.99 USD at Amazon.com
Epson SF-510 Review 4 1.3 0 0 0 0 4 Epson SF-510 $88.95 USD at Amazon.com
Garmin 10 Review 2 0.6 0 0 0 0 2 Garmin 10 $89.99 USD at Amazon.com
(Referbished $45.33)

4 Score Breakdown with a Stryd Footpod

Review Score Value for money6 How far did
you run?1
How fast are
you running?2
Where are
you?3
What's your
cadence?4
Bonus Points5

Price at Amazon.com

Garmin Epix Review 47 4.5 10 10 9 10 8 Garmin Epix $365.66 USD at Amazon.com
(Referbished $189.95)
Garmin Fenix 5X Review 47 2.9 10 10 9 10 8 Garmin Fenix 5X Review
Garmin Fenix 3 Review 45 3.8 10 10 7 10 8 Fenix 3 $449.99 USD at Amazon.com
(Referbished $299.95)
Garmin Vivoactive HR Review 40 4.9 10 10 1 10 9 Garmin Vivoactive HR $. at Amazon.com
(Referbished $144.95)
Garmin 920XT Review 39 4.4 10 10 1 10 8 Garmin 920XT without HRM $259.99 USD at Amazon.com
(Referbished $289.00)
Garmin Vivoactive Review 34 5.1 10 10 0 10 4 Garmin Vivoactive $159.99 USD at Amazon.com
(Referbished $99.00)
Suunto Ambit2 Review 32 3.9 10 10 6 0 6 Suunto Ambit2 $289.99 USD (new) at Amazon.com
Suunto Ambit3 Peak Review 32 3.4 10 10 6 0 6 Suunto Ambit3 Peak $339.20 USD at Amazon.com
Suunto Ambit3 Run Review 30 4 10 10 5 0 5 Suunto Ambit3 Run $. (new) at Amazon.com
Suunto Ambit2 R Review 30 3.5 10 10 5 0 5 Suunto Ambit2 R without HRM $249.00 USD at Amazon.com
Garmin 235 Review 28 2.9 10 10 0 0 8 Garmin 235 $327.99 USD (new) at Amazon.com
(Referbished $349.98)
Garmin 620 Review 27 3.8 10 10 0 0 7 Garmin 620 without HRM price not listed at Amazon.com
Garmin 910XT Review 26 3.9 10 10 1 0 5 Garmin 910XT without HRM price not listed at Amazon.com
Garmin Fenix 2 Review 26 2.4 10 10 1 0 5 Garmin Fenix 2 without HRM price not listed at Amazon.com
Suunto Spartan Ultra Review 26 1.8 10 10 1 0 5 Suunto Spartan Ultra $528.56 USD at Amazon.com
Garmin 310XT Review 25 4.6 10 10 0 0 5 Garmin 310XT without HRM
price not listed at Amazon.com
Garmin 225 Review 25 3.8 10 10 0 0 5 Garmin 225 $119.32 USD (used) at Amazon.com
(Referbished $144.95)
TomTom Cardio Runner Review 25 3.3 10 10 0 0 5 TomTom Cardio Runner price not listed at Amazon.com
Polar V800 Review 25 2.1 10 10 1 0 4 Polar V800 without HRM $449.95 USD (new) at Amazon.com
Polar M400 Review 24 4.1 10 10 1 0 3 Polar M400 without HRM $126.59 USD at Amazon.com
(Referbished $99.99)
Garmin 610 Review 24 3.3 10 10 0 0 4 Garmin 610 without HRM price not listed at Amazon.com
Leikr Review 10 1 5 2 0 0 3 Leikr ($380)
Epson SF-510 Review 4 0.7 0 0 0 0 4 Epson SF-510 $88.95 USD at Amazon.com
Epson SF-810 Review 4 0.6 1 0 0 0 3 Epson SF-810 $119.99 USD at Amazon.com
Garmin 10 Review 2 0.3 0 0 0 0 2 Garmin 10 $89.99 USD at Amazon.com
(Referbished $45.33)

5 Basic Features

Review

Released GPS
Accuracy
Weight (oz) Size (CM3) Display (mm) Resolution (Pixels) Waterproofing Pace from
FootPod with GPS Enabled
Heart Rate
Monitor
Cadence Data Upload
Garmin Epix Review 2015 6.2 3.0 48 29 x 21 (609mm2) 205 x 148 (30.3K total) Good (50m) Yes Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
Garmin 910XT Review 2011 7.5 2.5 49 33 x 20 (660mm2) 160 x 100 (16K total) Good (50m) Yes Yes Footpod/Alert Yes
Suunto Ambit3 Run Review 2014 7.9 2.5 30 29 (round) (661mm2) 128 x 128 (16.4K total) Good (50m) No Yes Internal/Footpod Yes
Garmin 920XT Review 2014 6.6 2.2 35 29 x 21 (609mm2) 205 x 148 (30.3K total) Good (50m) Yes Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
Suunto Ambit3 Peak Review 2014 7.9 2.9 30 29 (round) (661mm2) 128 x 128 (16.4K total) Good (100m) No Yes Internal/Footpod Yes
Leikr Review 2013 7.3 2.4 25 41 x 31 (1271mm2) 206 x 148 (76.8K total) Fair (IPX6) Yes Yes Footpod Limited
Garmin 310XT Review 2009 7.5 2.5 63 33 x 20 (660mm2) 160 x 100 (16K total) Good (50m) Yes Yes Footpod Yes
Garmin Fenix 3 Review 2015 6.2 2.9 33 30 (round) (726mm2) 218 diameter (37.3K total) Good (100m) Yes Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
Garmin Fenix 5X Review 2017   3.5 36 30.5 (round) (731mm2) 240 diameter (45.2K total) Good (100m) Yes Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
Garmin 610 Review 2011 7.3 2.5 41 25.4 (round) (507mm2) 128 diameter (12.9K total) Fair (IPX7) Yes Yes Footpod/Alert Yes
Suunto Ambit2 Review 2013 7.6 3.1 30 29 (round) (661mm2) 128 x 128 (16.4K total) Good (100m) No Yes Internal/Footpod Yes
Suunto Ambit2 R Review 2013 7.6 2.5 30 29 (round) (661mm2) 128 x 128 (16.4K total) Good (50m) No Yes Internal/Footpod Yes
Polar V800 Review 2014 8.0 2.8 31 23 x 23 (529mm2) 128 x 128 (16.4K total) Good (30m) No Yes Internal/Footpod Limited
Garmin 235 Review 2015 4.9 1.5 19 31 (round) (755mm2) 215 x 180 (38.7K total) Good (50m) Yes Yes (+OHRM) Internal/Footpod Yes
Garmin Vivoactive Review 2015 5.4 1.3 13 29 x 21 (592mm2) 205 x 148 (30.3K total) Good (50m) No Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
Suunto Spartan Ultra Review 2016 7.1 2.7 38 32 (round) (804mm2) 56 x 32 (96K total) Good (100m) No Yes Internal (Limited Footpod) Yes
Garmin Vivoactive HR Review 2016 4.9 1.7 19 21 x 29 (609mm2) 148 x 205 (30.3K total) Good (50m) No Yes (+OHRM) Internal/Footpod/Heart Rate Monitor/Alert Yes
Garmin 225 Review 2015 6.2 1.5 24 25.4 (round) (507mm2) 180 diameter (25.4K total) Good (50m) No Yes (+OHRM) Internal/Footpod Yes
Garmin Fenix 2 Review 2014 5.7 3.2 32 31 (round) (755mm2) 70 diameter (3.8K total) Good (50m) No Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
Garmin 620 Review 2013 7.1 1.5 20 25.4 (round) (507mm2) 180 diameter (25.4K total) Good (50m) No Yes Internal/Footpod/Heart Rate Monitor/Alert Yes
TomTom Cardio Runner Review 2015 6.0 2.2 30 22 x 25 (550mm2) 144 x 168 (24.2K total) Good (50m) No Yes (+OHRM) Internal/Footpod Yes
Polar M400 Review 2014 4.4 2.0 24 23 x 23 (529mm2) 128 x 128 (16.4K total) Good (30m) No Yes Internal/Footpod Limited
Epson SF-810 Review 2015 5.5 1.8 28 28 (round) (616mm2) 128 diameter (12.9K total) Good (50m) No OHRM Only) Limited Internal Limited
Epson SF-510 Review 2015 4.4 1.7 24 28 x 22 (616mm2) 128 x 96 (12.3K total) Good (50m) No Yes Limited Internal Limited
Garmin 10 Review 2012 3.8 1.3 33 25 x 24 (600mm2) 55 x 32 (1.8K total) Good (50m) No No No Yes



Review

Battery
Life (hr)
Tested Battery
Life (hr)
Extended
Battery
Life (hr)
Charge on the run? Training
Effect
HRV GPS cache Sensors
Garmin Epix Review 24 17.6 50 Yes (with USB=Garmin) Yes Record Yes Ant+
Garmin 910XT Review 20   20 Yes, but no display Yes Record No Ant+
Suunto Ambit3 Run Review 10 10.5 100 Yes Yes Record Yes Bluetooth
Garmin 920XT Review 24 19 40 No (terminates) Yes Record Yes Ant+
Suunto Ambit3 Peak Review 20   100 Yes Yes Record Yes Bluetooth
Leikr Review 5 6.5 5 Yes, but can't be worn No No Yes (few hours) Ant+
Garmin 310XT Review 20   20 Yes, but no display No No No Ant+
Garmin Fenix 3 Review 20 22 50 Yes (with USB=Garmin) Yes No Yes Ant+
Garmin Fenix 5X Review 20 23 35 Yes, but can't be worn Yes   Yes Bluetooth/Ant+
Garmin 610 Review 8   8 Yes, but no display Yes Record No Ant+
Suunto Ambit2 Review 15   50 Yes Yes Record Yes Ant+
Suunto Ambit2 R Review 8 7.3 25 Yes Yes Record Yes Ant+
Polar V800 Review 13 24 50 No (terminates) Yes Display Predictive Bluetooth
Garmin 235 Review 11   11 Yes, but no optical HR Yes No Yes Ant+
Garmin Vivoactive Review 10 10 10 Yes (with USB=Garmin) No No Yes Ant+
Suunto Spartan Ultra Review 18 17 26 Yes, but can't be worn Yes Record Yes Bluetooth
Garmin Vivoactive HR Review 13   13 Yes (with USB=Garmin) No No Yes Ant+
Garmin 225 Review 10 11 10 No (resets) No No Yes Ant+
Garmin Fenix 2 Review 15   50 Yes (with USB=Garmin) Yes No Yes Ant+
Garmin 620 Review 10   10 No (resets) Yes Record Yes Ant+
TomTom Cardio Runner Review 8 6.3 8 No (resets) No No Yes Bluetooth HR
Polar M400 Review 8   8 Yes, but can't be worn No No No Bluetooth
Epson SF-810 Review 20 26 20 No No No Yes (few hours) None
Epson SF-510 Review 30 30 30 No No No Yes (few hours) Bluetooth HR
Garmin 10 Review 5   5 No No No No None

6 Navigation Features

Review

Color Maps Breadcrumbs Courses To Waypoint Compass Reverse course Beeline to start Connect IQ Altimeter
Garmin Epix Review Yes Yes Yes Yes Yes Yes No Yes Yes
Garmin 910XT Review No Yes Yes Yes No Yes Yes No Yes
Suunto Ambit3 Run Review No No Yes Yes Yes Yes Yes No No
Garmin 920XT Review No Yes Yes Yes Yes Yes No Yes Yes
Suunto Ambit3 Peak Review No No Yes Yes Yes Yes Yes No Yes
Leikr Review Yes Yes Yes No No No No No No
Garmin 310XT Review No Yes Yes Yes No Yes No No No
Garmin Fenix 3 Review No Yes Yes Yes Yes Yes No Yes Yes
Garmin Fenix 5X Review Yes Yes Yes Yes Yes Yes No No Yes
Garmin 610 Review No No Yes Yes No No Yes No No
Suunto Ambit2 Review No No Yes Yes Yes Yes Yes No Yes
Suunto Ambit2 R Review No No Yes Yes Yes Yes Yes No No
Polar V800 Review No No Yes No No No Yes No Yes
Garmin 235 Review No No No No No No Yes Yes No
Garmin Vivoactive Review No No No No No No Yes Yes No
Suunto Spartan Ultra Review No Yes Yes Yes Yes No Yes Yes Yes
Garmin Vivoactive HR Review No No No No No No No Yes Yes
Garmin 225 Review No No No No No No No No No
Garmin Fenix 2 Review No Yes Yes Yes Yes Yes No No Yes
Garmin 620 Review No No No No No No No No No
TomTom Cardio Runner Review No No No No No No No No No
Polar M400 Review No No No No No No Yes No No
Epson SF-810 Review No No No No No No No No No
Epson SF-510 Review No No No No No No No No No
Garmin 10 Review No No No No No No No No No

For "navigation":

  • Color Maps gives you full color maps, rather like a smart phone, with roads and paths marked out.
  • Track Outline is a display of where you've run, rather like a breadcrumb trail. If there are maps, the outline is superimposed otherwise this is just the outline on its own without any context.
  • Course Outline is an outline of a route that can be downloaded. I've found this useful during ultras or in unfamiliar cities where I've needed to know where to go.
  • Back To Start is a simple arrow point to your starting point, so it won't help you backtrack.
  • Back To Waypoint returns you to a previously marked location using a simple arrow to point.
  • Compass. A magnetic compass can help you orient yourself or the map. Without a magnetic compass you have to be moving for the GPS to give you a sense of direction.


(Older Reviews: Polar RC3 GPS, Soleus 1.0, Motorola Motoactv.)

7 What to Look for in a Running Watch

A modern running watch often has a huge number of features, but I think it's best to focus on its ability to answer these basic questions.

  • How far did I run? This is probably the key feature that most runners are looking for, and it requires good GPS accuracy. How much the accuracy of a watch will impact your running will depend on the course. Overall, most watches do pretty well in straight lines, but suffer when things get twisty. My testing is a tough challenge for GPS, so it highlights the differences between the great and the appalling.
  • How fast am I running? While you can work out your average pace from your distance and time, you'll often want to know how fast you're currently running. Unfortunately, GPS is rather poor at answering this question, so you need Pace From A Footpod. An accurate indication of your current pace is important for any training program that requires running at a specific pace, and for success in racing at many distances.
  • Where am I? It's not unreasonable to expect a GPS enabled watch to tell you where you are or how to get back to the start. Navigation varies from a simple compass needle showing the direction to return to the start to a display of the route you've just run or a preloaded course. The Motoactv and Fenix 2 can display preloaded maps showing roads and names, while the Epix and Leikr show full color maps.
  • What's my cadence? A display of Cadence is a critical training tool and newer watches are able to use an internal accelerometer to provide Cadence without any accessories. Other watches may need a Foodpod or the newer Garmin watches can use the running dynamics heart rate strap. A Cadence alert will help you stay in the right cadence range, and is a useful feature.

There are several additional features to you could consider, though I'd argue none are as important as the above questions.

  • Weight. None of these devices weigh enough to have a noticeable impact on running performance, but the weight can be noticeable.
  • Size. The size of these devices varies widely, and the larger devices can feel a little bulky, especially if you have a smaller wrist. I've provided the size as the volume in cubic centimeters to give a single number to compare.
  • Waterproofing. Even if you don't swim, having good waterproofing is important to prevent your watch being destroyed by the rain or sweat.
  • Heart Rate Monitor. Heart Rate is important information when training, though it is important to understand the limitations of heart rate based training. Having a Heart Rate Monitor that will record your heart rate is particularly valuable for evaluating your training.
  • Data Upload. The ability to record your workout and store it in a training log such as Dailymile or SportTracks is vital. All of the recommended watches here have that ability. I'd strongly advise even a new runner to store their data so that they can look back over the months and years to understand their progress. A watch that can upload to a PC makes recording your workouts much easier.
  • Battery Life. How much battery life you need depends on how long you run for. It's best to have a watch that will last quite a bit longer than your longest run. I list the claimed battery life in my table, along with the results of my testing. For my tests, I do everything to maximize battery life without compromising GPS accuracy. That means normal GPS sampling frequency, but no backlight, no map display, and no button presses. I also ensure Bluetooth, WAAS and GLONAS are disabled. I don't test devices that I've had for a while, as the battery tends to degrade over time.
  • Charges On The Run. For ultrarunners, one option to use a watch for longer than the built in battery lasts is to charge the watch while running. This involves connecting the cable and carrying a USB battery pack. It's cumbersome, but it can work. A value of "Yes" means that the watch will accept charge while recording and displaying as usual. Some watches have a "yes" with a caveat, such as the display not functioning or difficulty in connecting the cable while wearing the watch. An asterisk after the yes indicates a Garmin device that needs to be set with the USB mode to "Garmin" not "Mass Storage". A value of "no" means that charging is impossible.
  • Altimeter. An altimeter will measure the atmospheric pressure and give you altitude. This is more accurate than GPS, but will require calibration to adjust for weather related pressure changes.
  • Training Effect. This is a measure of how hard a training run is as a numeric value of 1.0 to 5.0, based on an analysis of Heart Rate Variability.
  • Heart Rate Variability. There is a growing interest in the possibility of using Heart Rate Variability (HRV) to evaluate training stress. While only one device will display HRV, there are several that will record HRV for later analysis.
  • GPS Pre-cache. Some newer watches will download the predicted positions of the GPS satellites for faster initial acquisition. This pre-cache works remarkably well, and the data is usually downloaded automatically when the watch is connected to the internet. However, the data is only valid for a few days, so after that time the device will fall back to the usual approach of scanning for satellites.

8 GPS Accuracy

An infographic of GPS Accuracy of running watches. The top right corner represents the most accurate watches. (This graphic uses ISO 5725 terminology.)

9 Using a Smartphone

Main article: Running With A Smartphone

Most smartphones have a GPS built in and support various applications that allow them to function as sports watches. These phones can have remarkable levels of GPS Accuracy as well as many other advantages.

10 Watches for Ultrarunning

Charging a watch on the run can work, but it's awkward at best.

Choosing a watch for an ultramarathon requires some tradeoffs and there's no simple answer. The main factor is battery life, and some runners will want navigation. I wish I could provide, simple, clear cut advice, but unfortunately things are not so easy. You'll need to think about how long you'll be running for, the features that are important to you, and how much compromise you can live with.

  • If you need good navigation information, then I'd suggest the Garmin Epix, though you'll need to carry a USB battery pack and charge on the go. The Epix will last for 17 hours, but using the navigation features will dramatically reduce that. For less money and better GPS Accuracy, consider the Garmin 910XT. The Garmin 920XT or the Garmin Fenix 3 have more features, but worse accuracy. (You'll still need the battery pack if you're going to use the navigation mapping with any of them.)
  • For races up to 20 hours the Suunto Ambit3 Peak has great accuracy and a small form factor.
  • For races up to 30 hours the Epson SF-510 is the least bad option. If you can afford it, get another watch that works better for training and shorter races, using the Epson only when you run for 20-30 hours.
  • For races over 30 hours I'd either charge on the go, or use the Suunto Ambit3 Peak again. You can get 200 hours with 60 second sampling, which would give you a rough idea of how far and where you've gone for more than a week. If you're going to charge on the go, then any of the watches that support this are viable.

10.1 Battery Life

  • The claimed battery lives don't hold up in the real world, with some watches going longer, others much shorter.
  • If you want the maximum battery life, you have to avoid the backlight, the use of map/course displays, and don't press the buttons unless you have to.
  • In my testing, the longest battery life that's available with GPS on is 30 hours with the Epson SF-510, 24 hours with the Polar V800, 22 hours with the Garmin Fenix 3, 19 with the Garmin 920XT, and 17 with the Garmin Epix.
  • Of the watches where I've not tested the battery life, there's 20 hours for the Suunto Ambit3 Peak, Garmin 310XT and Garmin 910XT. (I only test battery life on fairly new watches as the life degrades with usage.)
  • For ultras lasting less than 20 hours, such as 50 miles or 100 Km, you have plenty of choice and battery life should not constrain you too much.
  • For 24 hour races or 100 mile races where you expect a finish in the 24-30 hour range the Epson SF-510 is worth considering though the battery life is one of its few good points.
  • Some watches can extend the battery life by only taking a GPS fix less frequently. This can be acceptable on a straight course like the Keys 100 or Badwater, but it can be appalling on twisty trails. However, if you need more than 30 hours then this is you only option without recharging on the go.
    • The Suunto Ambit3 Peak has 20 hours with normal GPS recording, and 30 hours at 5 second sampling, which is great. It will go as high as 200 hours with 60 second sampling. There is some course display capability, but it's not as good others. There's also the cheaper Suunto Ambit3 Run that gives 15 hours at 5 second sampling, or 100 hours at 60 second sampling.
    • The Suunto Ambit2 R gives 20 hours in extended mode (60 second GPS sampling) and the more expensive Ambit2 gives 50 hours. There is some course display capability, but it's not as good others.
    • The Polar V800 has a stated battery life of 13 hours, but without Bluetooth I found it lasted for nearly 24 hours! The extended mode increases the rated life to 50 hour (I got just over 50 hours), and you can charge it on the run. The V800 has no map or course display.
    • Garmin's latest watches use a Variable type of UltraTrac. Instead of setting a fixed update frequency like 15 seconds, they dynamically vary the GPS recording interval and use the internal accelerometer to fill in the gaps. This makes it harder to predict how long the battery will last in a specific situation, something I dislike. There's no option for a fixed frequency extended recording mode.
  • Avoid the Garmin Fenix 2 which has mediocre GPS Accuracy even in normal mode and it has the occasional "lost satellite reception" problem.
  • You can turn off GPS and use a Footpod, which boost the battery life of most Garmin watches to several days. Obviously you lose navigation and while the accuracy of a Footpod can be better than GPS, the Footpod does not do so well if you're taking Walking Breaks or running on twisty single track.
  • You can extend the battery life a little by avoiding using the backlight or changing the display. Showing the course outline or the map seems to drain the battery quite fast. I've had 37+ hours out of the Suunto Ambit2 R in extended mode with these tricks.
  • You can charge some watches on the run (see table above). This is awkward at best, as you need the cable attached and to carry a USB battery pack, but some runners find this acceptable. I'd highly recommend something like this small battery pack that fits nicely in the hand - Anker PowerCore+ mini $39.99 USD at Amazon.com
  • Another option, depending on the race, is to have two watches and swap part way through.

10.2 Navigation

For some ultras (and shorter trail runs), navigation is a problem. I've been lost on the occasional race and it's a horrible experience. Even when I've been on course, the doubts and stress of worrying can be an enormous drain. My first GPS watch was purchased so that I'd have an outline of the course I was running and there were many races where I was glad of its comforting conformation. Remember that using the navigation features of these watches will dramatically reduce their battery life.