Leaks of the upcoming Garmin Forerunner have hit the interwebs. We were hoping to see a Garmin device with LTE, and we may just be looking at Garmin’s first untethered device.

The 645 Music will let you store about 800 songs, let you pair with a Bluetooth headphone and it is also stated to have the ability to sync music from selected streaming services. No word yet on if Garmin’s music offline service will be using Spotify.

Renders of the upcoming devices show it looks a lot alike the Vivoactive 3 with a blend of the Forerunner 935. Although it likely won’t have a touchscreen. Garmin itself leaked most of the tech specs, on its website before pulling them down. The round screen and discreet crown come with five physical buttons on the sides. The buttons read the same as the current Fenix and Forerunner 935 series. The device QuickFit straps come in a few colors is good for 5 ATM includes built-in GPS, a heart rate sensor and barometric altimeter, compass and thermometer. , Some of which were omitted from the previous version. Garmin Pay is also included so you can make payments phone-free.

There are multiple sports profiles just like Garmin’s other devices, and you can create your own custom workouts. Mapping won’t be part of the device which likely means you won’t be able to take this watch onto a golf course. If you have Garmin’s Running Dynamics Pod, you’ll also benefit from some advanced running dynamics, including ground contact time balance, stride length, vertical ratio among others so you’ll get training status, training load, and anaerobic training effect. Being Garmin, battery life will be excellent. Seven days in regular mode and 5 hours with GPS turn on with music. No news on price or when Garmin will release the watch. But it’s a good bet that we’ll likely see the device sometime in Q1 2018. We’ll have to wait till CES 2018 for more information.

Here’s what we think we know on Specs and if correct, this look like an excellent running watch

Headline RRP USD$450
Lens MaterialCorning® Gorilla® Glass 3
Bezel Materialstainless steel
Case material 
QuickFit™ watch band compatible 
Quick Release Bandsyes (20 mm, Industry standard)
Strap materialsilicone
Physical size42.5 x 42.5 x 13.5 mm
Weight42.2 g
Water rating5 ATM
Display typesunlight-visible, transflective memory-in-pixel (MIP)
Display size1.2″ (30.4 mm) diameter
Display resolution240 x 240 pixels
Color display Yes
Battery lifeSmartwatch Mode: Up to 7 days
GPS mode with music: Up to 5 hoursGPS mode: Up to 14 hours
 UltraTrac™ mode: Up to 24 hours without wrist heart rate
Memory/History200 hours of activity data
Clock Features 
GPS Time SyncYes
Automatic daylight saving timeYes
Alarm clockYes
Sunrise/sunset timesYes
Face It™ watch face creatorYes
Garmin Elevate™ wrist heart rate monitorYes
Barometric altimeterYes
Daily Smart Features 
ConnectivityBluetooth®, ANT+®, Wi-Fi®
Connect IQ™ (downloadable watch faces, data fields, widgets and apps)Yes
Smart notificationsYes
Text response/reject phone call with text (Android™ only)Yes
Music controlsYes
Plays Onboard MusicYes
Music Storageup to 800 songs
Find My PhoneYes
Find My WatchYes
VIRB® remoteYes
Smartphone compatibilityiPhone® and Android™
Compatible with Garmin Connect™ MobileYes
Garmin Pay™Yes
Activity Tracking Features 
Step counterYes
Move bar (displays on device after a period of inactivity; walk for a couple of minutes to reset it)Yes
Auto goal (learns your activity level and assigns a daily step goal)Yes
Sleep monitoring (monitors total sleep and periods of movement or restful sleep)Yes
Calories burnedYes
Floors climbedYes
Distance traveledYes
Intensity minutesYes
Move IQ™Yes
Fitness Ageyes (in app)
Fitness Equipment/Gym 
Preloaded gym activity profilesStrength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga
Cardio workoutsYes
Strength workoutsYes
Automatic rep countingYes
Training, Planning and Analysis Features 
GPS speed and distanceYes
Customizable data pagesYes
Customizable activity profilesYes
Auto Pause®Yes
Advanced workoutsYes
Downloadable training plansYes
Auto Lap®Yes
Manual lapYes
Virtual PartnerYes
Configurable lap alertsYes
V02 maxYes
Training Status (lets you see if you’re training effectively by tracking your training history and fitness level trend.)Yes
Training Load (your total training load for the last 7 days calculated from estimated EPOC)Yes
Training Effect (aerobic)Yes
Training Effect (anaerobic)Yes
Customizable alertsYes
Audio promptsYes
Finish timeYes
Race an ActivityYes
Auto multisport activitiesYes
Manual multisport activitiesYes
Course guidanceYes
Segments (Live, Garmin)Yes
Strava features (Beacon, live segments)Yes
Group LiveTrackYes
Touch and/or button lockYes
Hot keysYes
Auto scrollYes
Activity history on watchYes
Heart Rate Features 
HR zonesYes
HR alertsYes
HR caloriesYes
% HR maxYes
% HRRYes
Recovery timeYes
Auto max HRYes
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)yes (with compatible accessory)
Records heart rate while swimmingNo
HR Broadcast (broadcasts HR data over ANT+™ to paired devices)Yes
Running Features 
Preloaded run profilesRunning, Treadmill Running, Indoor Track
GPS-based distance, time and paceYes
Running dynamics (with accessory)Yes
Vertical oscillation and ratio with accessory)Yes
Ground contact time and balance (with accessory)Yes
Stride length with accessory)Yes
Performance conditionYes
Lactate threshold (with accessory)Yes
Run workoutsYes
Race predictorYes
Foot pod capableYes
Outdoor Recreation Features 
Preloaded outdoor recreation profilesSkiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Point-to-point navigationYes
Bread crumb trail in real timeYes
Back to startYes
UltraTrac modeYes
Elevation profileYes
Distance to destinationYes
Barometric trend indicatorNo
Storm alertNo
Trail run auto climbNo
Vertical speedYes
Total ascent/descentYes
Compatible with BaseCamp™Yes
GPS coordinatesYes
Projected waypointNo
Sight ‘N GoNo
Area calculationNo
Hunt/fish calendarNo
Sun and moon informationNo
Dual grid coordinatesNo
Cycling Features 
Preloaded cycling profilesBiking, Indoor Biking
Bike lap and lap maximum power (with power sensor)No Power
Race an activityYes
Time/distance alerts (triggers alarm when you reach goal)Yes
Interval trainingYes
FTP (with accessory)No
Compatible with Vector™ (power meter)No Cycling Power
Power meter compatible (displays power data from compatible third-party ANT+™-enabled power meters)No Cycling Power
Compatible with Varia Vision™ (head-mounted display)Yes
Compatible with Varia™ radar (rear-facing radar)Yes
Compatible with Varia™ lightsYes
Speed and cadence sensor support (with sensor)yes (ANT+® and Bluetooth® Smart)
Swimming Features 
Preloaded swim profilesPool Swimming
Pool swim metrics (lengths, distance, pace, stroke count/rate, calories)Yes
Stroke type detection (freestyle, backstroke, breaststroke, butterfly)Yes
Swim efficiency (SWOLF)Yes
Drill loggingYes
Pool swim workoutsYes
Open-water swim metrics (distance, pace, stroke count/rate, stroke distance, calories)No
Heart rate (real-time during rests, interval and session stats during rests, and automatic heart rate download post-swim)Yes


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