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 Material Corning® Gorilla® Glass 3
Bezel Material stainless steel
Case material  
QuickFit™ watch band compatible  
Quick Release Bands yes (20 mm, Industry standard)
Strap material silicone
Physical size 42.5 x 42.5 x 13.5 mm
Weight 42.2 g
Water rating 5 ATM
Display type sunlight-visible, transflective memory-in-pixel (MIP)
Display size 1.2″ (30.4 mm) diameter
Display resolution 240 x 240 pixels
Color display  Yes
Battery life Smartwatch Mode: Up to 7 days
GPS mode with music: Up to 5 hours GPS mode: Up to 14 hours
  UltraTrac™ mode: Up to 24 hours without wrist heart rate
Memory/History 200 hours of activity data
Clock Features  
Time/date Yes
GPS Time Sync Yes
Automatic daylight saving time Yes
Alarm clock Yes
Timer Yes
Stopwatch Yes
Sunrise/sunset times Yes
Face It™ watch face creator Yes
Garmin Elevate™ wrist heart rate monitor Yes
Barometric altimeter Yes
Compass Yes
Gyroscope Yes
Accelerometer Yes
Thermometer Yes
Daily Smart Features  
Connectivity Bluetooth®, ANT+®, Wi-Fi®
Connect IQ™ (downloadable watch faces, data fields, widgets and apps) Yes
Smart notifications Yes
Text response/reject phone call with text (Android™ only) Yes
Calendar Yes
Weather Yes
Music controls Yes
Plays Onboard Music Yes
Music Storage up to 800 songs
Find My Phone Yes
Find My Watch Yes
VIRB® remote Yes
Smartphone compatibility iPhone® and Android™
Compatible with Garmin Connect™ Mobile Yes
Garmin Pay™ Yes
Activity Tracking Features  
Step counter Yes
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 burned Yes
Floors climbed Yes
Distance traveled Yes
Intensity minutes Yes
TrueUp™ Yes
Move IQ™ Yes
Fitness Age yes (in app)
Fitness Equipment/Gym  
Preloaded gym activity profiles Strength Training, Cardio Training, Elliptical Training, Stair Stepping, Floor Climbing, Indoor Rowing and Yoga
Cardio workouts Yes
Strength workouts Yes
Automatic rep counting Yes
Training, Planning and Analysis Features  
GPS speed and distance Yes
Customizable data pages Yes
Customizable activity profiles Yes
Auto Pause® Yes
Advanced workouts Yes
Downloadable training plans Yes
Auto Lap® Yes
Manual lap Yes
Virtual Partner Yes
Configurable lap alerts Yes
V02 max Yes
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 alerts Yes
Audio prompts Yes
Finish time Yes
Race an Activity Yes
Auto multisport activities Yes
Manual multisport activities Yes
Course guidance Yes
Segments (Live, Garmin) Yes
Strava features (Beacon, live segments) Yes
LiveTrack Yes
Group LiveTrack Yes
Touch and/or button lock Yes
Hot keys Yes
Auto scroll Yes
Activity history on watch Yes
Heart Rate Features  
HR zones Yes
HR alerts Yes
HR calories Yes
% HR max Yes
% HRR Yes
Recovery time Yes
Auto max HR Yes
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 swimming No
HR Broadcast (broadcasts HR data over ANT+™ to paired devices) Yes
Running Features  
Preloaded run profiles Running, Treadmill Running, Indoor Track
GPS-based distance, time and pace Yes
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
Cadence Yes
Performance condition Yes
Lactate threshold (with accessory) Yes
Run workouts Yes
Race predictor Yes
Foot pod capable Yes
Outdoor Recreation Features  
Preloaded outdoor recreation profiles Skiing, Snowboarding, XC Skiing, Stand up Paddleboarding, Rowing
Point-to-point navigation Yes
Bread crumb trail in real time Yes
Back to start Yes
TracBack® Yes
UltraTrac mode Yes
Elevation profile Yes
Distance to destination Yes
Barometric trend indicator No
Storm alert No
Trail run auto climb No
Vertical speed Yes
Total ascent/descent Yes
Compatible with BaseCamp™ Yes
GPS coordinates Yes
Projected waypoint No
Sight ‘N Go No
Area calculation No
Hunt/fish calendar No
Sun and moon information No
Dual grid coordinates No
Cycling Features  
Preloaded cycling profiles Biking, Indoor Biking
Courses Yes
Bike lap and lap maximum power (with power sensor) No Power
Race an activity Yes
Time/distance alerts (triggers alarm when you reach goal) Yes
Interval training Yes
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™ lights Yes
Speed and cadence sensor support (with sensor) yes (ANT+® and Bluetooth® Smart)
Swimming Features  
Preloaded swim profiles Pool 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 logging Yes
Pool swim workouts Yes
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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