Product Comparison

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Forerunner® 620
from £269.99
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Forerunner® 910XT
from £289.99
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Forerunner® 310XT
from £209.99
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Forerunner® 620
from £269.99
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Forerunner® 910XT
from £289.99
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Forerunner® 310XT
from £209.99
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Forerunner® 305
£199.99

Physical & Performance

Physical dimensions 1.8" x 1.8" x 0.5" (45 x 45 x 12.5 mm) 2.1" x 2.4" x 0.6" (54 x 61 x 15 mm) 2.1" x 2.2" x 0.8" (54 x 56 x 19 mm) 2.1" x 2.7" x 0.7" (5.33 x 6.86 x 1.78 cm)
Display size, WxH 1.0" (25.4 mm) diameter 1.3" x 0.8" (33 x 20 mm) 1.3" x 0.8" (33 x 20 mm) 1.3" x 0.8" (3.3 x 2.0 cm)
Display resolution, WxH 180 x 180 pixels 160 x 100 pixels 160 x 100 pixels
Touchscreen
Color display
Weight 1.5 oz (43.6 g) 2.5 oz (72 g) 2.5 oz (72 g) 2.72 oz (77 g)
Battery Rechargeable lithium-ion Rechargeable lithium-ion Rechargeable lithium-ion rechargeable lithium-ion
Battery life Up to 6 weeks in watch mode; up to 10 hours in training mode Up to 20 hours Up to 20 hours 10 hours, typical
Water rating 5 ATM 5 ATM 5 ATM IPX7
GPS-enabled
High-sensitivity receiver
Barometric altimeter
Vibration alert
Watch functions Includes date and alarm.

Maps & Memory

Waypoints/favorites/locations 0 100 100 100
Routes 0 50
History 1000 laps 1000 laps 1000 laps 1000 laps

Running Features

Virtual Pacer™ (compares current pace to target)
V02 max estimate
Recovery advisor
Race predictor
Running dynamics
Accelerometer (calculates distance for indoor workouts, without need for a foot pod)
Personal records

Cycling Features

Compatible with Vector™
Multiple bike profiles
Bike speed/cadence sensor Yes (optional) Yes (optional) Yes (optional) Yes (Some versions)

Performance Features

Heart rate monitor Yes (Some versions) Yes (Some versions) Yes (Some versions)
Foot pod Yes (optional) Yes (optional) Yes (optional) Yes (optional)
Virtual Partner® (train against a digital person)
Virtual Racer™ (compete against other activities)
Courses (compete against previous activities)
Auto Pause® (pauses and resumes timer based on speed)
Auto Lap® (automatically starts a new lap)
Auto Scroll (cycles through data pages during workout)
Multi-sport
Auto multisport (switch sport modes with 1 button press)
Advanced workouts (create custom, goal-oriented workouts)
Pace alert (triggers alarm if you vary from preset pace) Yes (for advanced workouts only) Yes (for advanced workouts only)
Time/distance alert (triggers alarm when you reach goal)
Interval training (set up exercise and rest intervals)
Heart rate-based calorie computation
Calculates calories burned
Training Effect (measures impact of an activity on your aerobic fitness)
Customizable screen(s)
Power meter compatible (displays power data from compatible 3rd party ANT+™-enabled power meters) Yes (records data approx. 1 per second) Yes (records data approx. 1 per second)
Shock Resistant

Swimming Features

Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)
Stroke type identification (e.g. freestyle)
Open water swim metrics (distance, pace, stroke count/rate, calories)

Garmin Connect™

Garmin Connect™ compatible (online community where you analyze, categorize and share data)
Automatic sync (automatically transfers data to your computer)

Additional

Additional

V0₂ max estimate: Yes

Recovery advisor: Yes

Race predictor: Yes

Running dynamics: Yes

Watch functions include date and alarm.

Run/walk feature: Yes

This USB mass storage device is compatible with Windows® XP or newer and Mac® OS X 10.4 or later.

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