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COMPARE GPS: GARMIN FORERUNNER SERIES

Garmin Forerunners are a popular fitness watch for runners. With many different styles and colours to choose from, it's easy to see why runners chose Garmin to track their performance.

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Garmin Forerunners
Forerunner 45s/45
Forerunner 245
Forerunner 245 Music
Forerunner 645 Music
Forerunner 745
Forerunner 945
forerunner 45
Forerunner 245
Forerunner 245 Music
forerunner 645 music
forerunner 745
Forerunner 945
General Features            
Unit dimensions, WxHxD
45: 42 x 42 x 11.4 mm
45S: 39.5 x 39.5 x 11.4 mm
42.3 x 42.3 x 12.2 mm
42.3 x 42.3 x 12.2 mm
42.5 x 42.5 x 13.5 mm
43.8 x 43.8 x 13.3 mm
47 x 47 x 13.9 mm
Display size, WxH
1.04" (26.3 mm) diameter
1.2" (30.4 mm) diameter
1.2" (30.4 mm) diameter
1.2" (30.4 mm) diameter
1.2" (30.4 mm) diameter
1.2" (30.4 mm) diameter
Display resolution, WxH
208 x 208 pixels
240 x 240 pixels
240 x 240 pixels
240 x 240 pixels
240 x 240 pixels
240 x 240 pixels
Weight
45: 36 g
45S: 32 g
38.5 g
38.5 g
42.2 g
47 g
50 g
Battery
rechargeable
lithium-ion
rechargeable
lithium-ion
rechargeable
lithium-ion
rechargeable
lithium-ion
rechargeable
lithium-ion
rechargeable
lithium-ion
Battery life
Smartwatch Mode: Up to 7 days
GPS mode: Up to 13 hours
Smartwatch Mode: Up to 7 days
GPS mode: Up to 24 hours
Smartwatch Mode: Up to 7 days
GPS mode with music: Up to 6 hours
GPS mode: Up to 24 hours
Smartwatch Mode: Up to 7 days
GPS mode with music: Up to 5 hours
Smartwatch mode: Up to 7 days
GPS mode with music: Up to 6 hours
GPS mode without music: Up to 16 hours
UltraTrac™ mode: Up to 21 hours
Smart Mode: Up to 2 weeks
GPS mode with music: Up to 10 hours
GPS mode without music: Up to 36 hours
Waterproof
✔(50m)
✔(50m)
✔(50m)
✔(50m)
✔(50m)
✔(50m)
History
200 hours of activity data
200 hours of activity data
200 hours of activity data
200 hours of activity data
200 hours of activity data
200 hours of activity data

Garmin Running
Forerunner 45s/45
Forerunner 245
Forerunner 245 Music
Forerunner 645 Music
Forerunner 745
Forerunner 945
forerunner 45
Forerunner 245
Forerunner 245 Music
forerunner 645 music
forerunner 745
Forerunner 945
Clock Features            
Time/date
GPS Time Sync
Automatic daylight saving time
Alarm clock
Timer
Stopwatch
Sunrise/sunset times
x
Face It watch face creator
x
Sensors            
GPS
GLONASS
Galileo
Garmin Elevate wrist heart rate monitor
Barometric altimeter
x
x
x
Compass
x
Gyroscope
x
x
x
Accelerometer
Thermometer
x
Pulse Ox Blood Oxygen Saturation Monitor
x
x
Daily Smart Features            
Connectivity
Bluetooth®, ANT+®
Bluetooth® Smart, ANT+®, Wi-Fi®
Bluetooth® Smart, ANT+®, Wi-Fi®
Bluetooth® Smart, ANT+®, Wi-Fi®
Bluetooth® Smart, ANT+®, Wi-Fi®
Connect IQ® (downloadable watch faces, data fields, widgets and apps)
✔ (watch faces only)
✔  
✔  
✔  
Smart notifications
✔  
✔  
✔  
✔  
Text response/reject phone call with text (Android® only)
x
Calendar
✔  
Weather
✔  
Controls smartphone music
✔  
✔  
✔  
✔  
Plays and controls watch music
✔  
x
Music Storage
x
x
✔(up to 500 songs)
✔(up to 500 songs)
✔(up to 500 songs)
✔(up to 1000 songs)
Find my Phone feature
✔  
Find My Watch feature
✔  
VIRB® remote
x
Smartphone compatibility
iPhone® and Android®
iPhone® and Android®
iPhone® and Android®
iPhone® and Android®
iPhone®, Android®
iPhone®, Android®
Compatible with Garmin Connect® Mobile
Garmin Pay®
x
x
x
Health Monitoring        
Wrist-based Heart Rate (constant, every second)
Daily Resting Heart Rate
Abnormal Heart Rate Alerts
✔  
Respiration rate (24x7)
Pulse Ox
x
(spot-check and optionally in sleep)
(spot-check and optionally in sleep)
x
✔(spot-check, and optional all-day acclimation and in sleep)
Fitness Age
✔(in app)
✔(in app)
✔(in app)
✔(in app)
Body Battery® Energy Monitor
x
✔(in app)
✔(in app)
All-day Stress Tracking
Relaxation breathing timer
Sleep monitoring (monitors total sleep and periods of movement or restful sleep)
Advanced sleep monitoring (sleep score & insights)
x
x
x
x
Hydration
yes (in Garmin Connect)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
Menstrual Cycle yes (in Garmin Connect)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
yes (in Garmin Connect and optional Connect IQ widget)
Activity Tracking Features        
Step counter
Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it)
Auto goal (learns your activity level and assigns a daily step goal)
✔  
✔  
Calories burned
Floors climbed
x
x
x
Distance traveled
Intensity minutes
✔  
✔  
TrueUp®
Move IQ®
Body Battery® Energy Monitor
x
✔(in app)
✔(in app)
All-day Stress Tracking
Garmin running
Forerunner 45s/45
Forerunner 245
Forerunner 245 Music
Forerunner 645 Music
Forerunner 745
Forerunner 945
forerunner 45
Forerunner 245
Forerunner 245 Music
forerunner 645 music
forerunner 745
Forerunner 945
Training, Planning and Analysis Features        
Activity history on watch
Customizable activity profiles
Customizable alerts
x
Audio prompts
Auto multisport activities
x
x
x
x
Course guidance
x
Advanced workouts (create custom, goal-oriented workouts):
Auto Lap®
Auto Pause®
Auto scroll
x
Customizable data pages
Manual multisport activities
x
x
x
x
Virtual Partner
x
Finish time
x
Group LiveTrack
x
x
x
Fitness Age
✔(in app)
✔(in app)
✔(in app)
✔(in app)
✔(in app)
✔(in app)
Hot keys
x
x
x
x
Configurable lap alerts
x
Touch and/or button lock
Manual lap
Personal records (running, cycling, swimming)
x
Segments (Live, Garmin)
x
GPS speed and distance
Training Effect (aerobic)
x
Training Effect (anaerobic)
x
Training Load (your total training load for the last 7 days calculated from estimated EPOC)
x
Downloadable training plans
Training Status (lets you see if you're training effectively by tracking your training history and fitness level trend.)
x
V02 max
Vibration alerts
x
Virtual Racer
x
x
x
Heart Rate Features            
HR zones
HR alerts
HR calories
% HR max
x
% HRR
x
Recovery time
x
Auto max HR
x
HRV stress test (measures your heart rate variability while standing still, for 3 minutes, to provide you with an estimated stress level; the scale of this is 1 to 100; low scores indicate lower stress levels)
x
x
x
x
✔ (with compatible accessory)
✔ (with compatible accessory)
HR strap compatible
✔(ANT+® and Bluetooth® Smart)
✔(ANT+® and Bluetooth® Smart)
Records heart rate while swimming
x
x
x
x
✔(with HRM-Tri and HRM-Swim)
✔(with HRM-Tri and HRM-Swim)
HR Broadcast (broadcasts HR data over ANT to paired devices)
Garmin running
Forerunner 45s/45
Forerunner 245
Forerunner 245 Music
Forerunner 645 Music
Forerunner 745
Forerunner 945
forerunner 45
Forerunner 245
Forerunner 245 Music
forerunner 645 music
forerunner 745
Forerunner 945
Running Features        
Preloaded run profiles
Running, Treadmill Running. Indoor Track Running may be added through app
Running, Treadmill Running,Trail Running, Indoor Track
Running, Treadmill Running,Trail Running,Indoor Track
Running, Treadmill Running, Indoor Track
Running, Treadmill Running, Indoor and Outdoor Track Running, Virtual Running, Trail Running
Running, Treadmill Running,Trail Running,Indoor Track
GPS-based distance, time and pace
Running dynamics
x  
✔(with compatible accessory)  
✔(with compatible accessory)  
✔(with compatible accessory)
✔(with compatible accessory)
Vertical oscillation and ratio (the degree of 'bounce' in your running motion and the cost-benefit ratio with stride length)
x  
✔(with compatible accessory)  
✔(with compatible accessory)  
x  
✔(with compatible accessory)
✔(with compatible accessory)
Ground contact time and balance (shows how much time, in the running motion, your foot is on the ground rather than in flight and lets you check your running symmetry)
x  
✔(with compatible accessory)  
✔(with compatible accessory)  
x  
✔(with compatible accessory)
✔(with compatible accessory)
Stride length (real time)
x  
✔(with compatible accessory)  
✔(with compatible accessory)  
x  
✔(with compatible accessory)
✔(with compatible accessory)
Cadence (provides real-time number of steps per minute)
Physiological measurements
x
Performance condition (after running 20 minutes, compares your real-time condition to your average fitness level)
x  
Lactate threshold (through analysis of your pace and heart rate, estimates the point where your muscles start to rapidly fatigue)
x  
x  
x  
x  
✔(with compatible accessory)
✔(with compatible accessory)
PacePro™ Pacing Strategies
x
x  
Run workouts
Race predictor
x
Foot pod capable
Safety and Tracking Features        
Incident Detection during select activities
✔(Smartphone Required)
✔(Smartphone Required)
✔(Smartphone Required)
x
✔(Smartphone Required)
✔(Smartphone Required)
Assistance
✔(Smartphone Required)
✔(Smartphone Required)
✔(Smartphone Required)
x
✔(Smartphone Required)
✔(Smartphone Required)
LiveTrack
Group Live Track
x
x
x
x
Live Event Sharing
✔Android® Only
✔Android® Only
✔Android® Only
x
✔Android® Only
✔Android® Only
Fitness Equipment/Gym        
Preloaded gym activity profiles
Cardio and Elliptical Training, Stair Stepping, Yoga may be added through app
Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Indoor Rowing and Yoga
Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Indoor Rowing and Yoga
Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga
Strength, Cardio and Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing, Pilates and Yoga
Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Indoor Rowing and Yoga
Cardio workouts
x
Strength workouts
x
Yoga workouts
x
x
x
x  
Pilates workouts
x
x
x
x  
Automatic rep counting
x
Outdoor Recreation Features        
Preloaded outdoor recreation profiles
x
Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Hiking, Skiing, Snowboarding, Backcountry Skiing, XC Classic and Skate Skiing, Stand up Paddleboarding, Kayaking, Rowing
(Hiking, Climbing, Skiing, Snowboarding, XC Skiing, Stand Up Paddleboarding, Rowing, Kayaking)
Dual grid coordinates
x
x
x
x
x
Point-to-point navigation
x
Bread crumb trail in real time
x
Back to start
x
TracBack®
x
UltraTrac® mode
x
Around Me mode
x
x
x
x
x
Elevation profile
x
Distance to destination
x
Barometric trend indicator
x
x
x
x
Storm alert
x
x
x
x
Trail run auto climb
x
x
x
x
Vertical speed
x
Total ascent/descent
x
Compatible with BaseCamp®
x
x
x
x
x
Preloaded topographical maps
x
x
x
x
x
Downloadable cartography support
x
x
x
x
x
GPS coordinates
x
Projected waypoint
x
x
x
x
x
Sight 'N Go
x
x
x
x
Area calculation
x
x
x
x
✔(via Connect IQ®)
✔(via Connect IQ®)
Hunt/fish calendar
x
x
x
x
✔(via Connect IQ®)
✔(via Connect IQ®)
Sun and moon information
x
x
x
x
✔(via Connect IQ®)
✔(via Connect IQ®)
Dual grid coordinates
x
x
x
x
XERO® Locations
x
x
x
x
x
Cycling Features            
Preloaded cycling profiles
(Biking. Indoor Biking may be added through app)
✔(Biking, Indoor Biking)  
✔(Biking, Indoor Biking)  
✔(Biking, Indoor Biking)  
✔(Biking, Indoor Biking, Mountain Biking)
✔(Biking, Indoor Biking, Mountain Biking)
Courses (compete against previous activities)
x
✔  
✔  
✔  
Cycle Map (routable cycling-specific street map)
x
x
x
x
x
Bike lap and lap maximum power (with power sensor)
x
x
x
x
Race an activity
x
✔  
✔  
✔  
Time/distance alerts (triggers alarm when you reach goal)
x
✔  
✔  
✔  
Interval training
x
✔  
✔  
✔  
FTP (Functional Threshold Power)
x
x
x
x
✔(with compatible accessory)
✔(with compatible accessory)
Strava features (Beacon, live segments)
x
x
x
x
Compatible with Vector® (power meter)
x
x
x
x
Power meter compatible (displays power data from compatible third-party ANT+®-enabled power meters)
x
x
x
x
Compatible with Varia Vision® (head-mounted display)
x
Compatible with Varia® radar (rear-facing radar)
x
Compatible with Varia® lights
x
Speed and cadence sensor support (with sensor)
✔(ANT+® and Bluetooth® Smart sensors)
✔(ANT+® and Bluetooth® Smart sensors)
✔(ANT+® and Bluetooth® Smart sensors)
Swimming Features            
Preloaded swim profiles
x
✔(Pool Swimming)
✔(Pool Swimming)
✔(Pool Swimming)
✔(Pool Swimming, Open Water Swimming)
✔(Pool Swimming, Open Water Swimming)
Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, swim efficiency (SWOLF), calories)
x
x
x
x
Pool swim metrics (lengths, distance, pace, stroke count, swim efficiency (SWOLF), calories)
x
Stroke type detection (freestyle, backstroke, breaststroke, butterfly) (pool swim only)
x
Drill logging (pool swim only)
x
Swim efficiency (SWOLF)
x
x  
Basic rest timer (up from 0) (pool swim only)
x
"Repeat on" rest timer (pool swim only)
x
Auto rest (pool swim only)
x
x
x
x
Time and distance alerts
x
x
x
x
Pacing alerts (pool swim only)
x
x
x
x
Countdown start (pool swim only)
x
x
x
Pool swim workouts
x
Critical swim speed
x
x
x
x
Underwater wrist-based heart rate
x
x
Heart rate (real-time during rests, interval and sessions stats during rests, and automatic heart rate download post-swim)
x
x
x
x
✔ (with HRM-Tri™, HRM-Swim™ and HRM-Pro™)
✔ (with HRM-Tri™, HRM-Swim™ and HRM-Pro™)
Golfing Features            
Yardage to F/M/B (distance to front, middle and back of green)
x
x
x
x
x
Yardage to layups/doglegs
x
x
x
x
x
Measures shot distance (calculates exact yardage for shots from anywhere on course)
x
x
x
x
x
Digital scorecard
x
x
x
x
x
Stat tracking (strokes, putts per round, greens and fairways hit and average shot distance)
x
x
x
x
x
Save locations (mark course points of interest for future reference)
x
x
x
x
x
x
Garmin AutoShot®
x
x
x
x
x
Green View with manual pin position
x
x
x
x
x
Hazards and course targets
x
x
x
x
x
TruSwing® compatible
x
x
x
x
x
Round timer/odometer
x
x
x
x
x
Garmin running
Forerunner 45s/45
Forerunner 245
Forerunner 245 Music
Forerunner 645 Music
Forerunner 745
Forerunner 945
forerunner 45
Forerunner 245
Forerunner 245 Music
forerunner 645 music
forerunner 745
Forerunner 945
Multi-sport = automatically changes sport mode with a press of a button

Discontinued Garmin Forerunner Specifications & Accessories

If you're looking for product specifications or accessories for Garmin Forerunner fitness watches that are no longer in production, you may find them here:


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