FORERUNNER® 645/645 MUSIC Owner’s Manual
© 2018 Garmin Ltd. or its subsidiaries All rights reserved. Under the copyright laws, this manual may not be copied, in whole or in part, without the written consent of Garmin. Garmin reserves the right to change or improve its products and to make changes in the content of this manual without obligation to notify any person or organization of such changes or improvements. Go to www.garmin.com for current updates and supplemental information concerning the use of this product.
Table of Contents Introduction.....................................................................1 Keys ............................................................................................ 1 GPS Status and Status Icons ................................................ 1 Pairing Your Smartphone with Your Device ............................... 1 Enabling Bluetooth Notifications ............................................ 1 Viewing Notifications .......................................................
Connecting Headphones using Bluetooth Technology ............. 16 Garmin Pay................................................................... 16 Setting Up Your Garmin Pay Wallet ......................................... 16 Paying for a Purchase Using Your Watch ................................ 16 Adding a Card to Your Garmin Pay Wallet ............................... 16 Managing Your Garmin Pay Wallet ...................................... 16 Changing Your Garmin Pay Passcode ...........................
Introduction WARNING See the Important Safety and Product Information guide in the product box for product warnings and other important information. Always consult your physician before you begin or modify any exercise program. Keys 2 Bring your smartphone within 10 m (33 ft.) of your device. 3 Select LIGHT to turn on the device. The first time you turn on the device, it is in pairing mode. TIP: You can hold LIGHT and select to manually enter pairing mode.
Audio Prompts on Your Connected Headphones During an Activity, page 4). NOTE: The Lap Alert audio prompt is enabled by default. 1 From the settings in the Garmin Connect Mobile app, select Garmin Devices. 2 Select your device. 3 Select Activity Options > Audio Prompts. Turning Off the Bluetooth Smartphone Connection 1 Hold LIGHT to view the controls menu. 2 Select to turn off the Bluetooth smartphone connection on your Forerunner device.
• To mark a lap, select Lap. • To navigate back to the starting point of your activity along the path you traveled, select Back to Start > TracBack. NOTE: This feature is available only for activities that use GPS. • To navigate back to the starting point of your activity by the most direct path, select Back to Start > Straight Line. NOTE: This feature is available only for activities that use GPS. • To discard the activity and return to watch mode, select Discard > Yes.
Distance increments are based on the pool size selected for the activity profile. 5 Select an option: • To start another drill interval, select BACK. • To start a swim interval, select UP or DOWN to return to the swim training screens. Viewing Your Ski Runs Your device records the details of each skiing or snowboarding run using the auto run feature. This feature is turned on by default for downhill skiing and snowboarding. It automatically records new ski runs based on your movement.
11 Select BACK. 12 Select one or more options: • To set the number of repetitions, select Repeat. • To add an open-ended warm up to your workout, select Warm Up > On. • To add an open-ended cool down to your workout, select Cool Down > On. Starting an Interval Workout From the watch face, select START. Select an activity. Hold UP. Select Training > Intervals > Do Workout. Select START to start the timer. When your interval workout has a warm up, select BACK to begin the first interval.
3 Select a sport. 4 Select a record to delete. 5 Select Clear Record > Yes. NOTE: This does not delete any saved activities. Clearing All Personal Records 1 Hold UP. 2 Select History > Records. NOTE: This does not delete any saved activities. 3 Select a sport. 4 Select Clear All Records > Yes. The records are deleted for that sport only. Segments You can send running or cycling segments from your Garmin Connect account to your device.
according to increasing intensity. Generally, heart rate zones are calculated based on percentages of your maximum heart rate. Setting Your Heart Rate Zones The device uses your user profile information from the initial setup to determine your default heart rate zones. You can set separate heart rate zones for sport profiles, such as running, cycling, and swimming. For the most accurate calorie data during your activity, set your maximum heart rate.
NOTE: Naps are not added to your sleep statistics. You can use do not disturb mode to turn off notifications and alerts, with the exception of alarms (Using Do Not Disturb Mode, page 8). Using Automated Sleep Tracking 1 Wear your device while sleeping. 2 Upload your sleep tracking data to the Garmin Connect site (Garmin Connect, page 17). You can view your sleep statistics on your Garmin Connect account.
Broadcasting Heart Rate Data to Garmin Devices ® You can broadcast your heart rate data from your Forerunner device and view it on paired Garmin devices. NOTE: Broadcasting heart rate data decreases battery life. 1 From the heart rate widget, hold UP. 2 Select Options > Broadcast Heart Rate. The Forerunner device starts broadcasting your heart rate data, and appears. NOTE: You can view only the heart rate widget while broadcasting heart rate data from the heart rate widget.
runners. More experienced runners tend to exhibit shorter ground contact times, lower vertical oscillation, lower vertical ratio, and higher cadence than less experienced runners. However, taller runners typically have slightly slower cadences, longer strides, and slightly higher vertical oscillation. Vertical ratio is your vertical oscillation divided by stride length. It is not correlated with height. Go to www.garmin.com/runningdynamics for more information on running dynamics.
EPOC is an estimate of how much energy it takes for your body to recover after exercise. Predicted race times: Your device uses the VO2 max. estimate and published data sources to provide a target race time based on your current state of fitness. This projection also presumes you have completed the proper training for the race. HRV stress test: The HRV (heart rate variability) stress test requires a Garmin chest heart rate monitor.
Viewing Your Recovery Time For the most accurate estimate, complete the user profile setup (Setting Up Your User Profile, page 6), and set your maximum heart rate (Setting Your Heart Rate Zones, page 7). 1 Go for a run. 2 After your run, select Save. The recovery time appears. The maximum time is 4 days. NOTE: From the watch face, you can select UP or DOWN to view the performance widget, and select START to scroll through the performance measurements to view your recovery time.
add performance condition as a data field to one of your training screens to monitor your ability throughout the activity. Performance condition can also be an indicator of fatigue level, especially at the end of a long training run. NOTE: The device requires a few runs with a heart rate monitor to get an accurate VO2 max. estimate and learn about your running ability (About VO2 Max. Estimates, page 11).
The Forerunner device begins searching for your paired mobile device. An audible alert sounds on your mobile device, and the Bluetooth signal strength displays on the Forerunner device screen. The Bluetooth signal strength increases as you move closer to your mobile device. 3 Select BACK to stop searching. Widgets Your device comes preloaded with widgets that provide at-aglance information. Some widgets require a Bluetooth connection to a compatible smartphone. Some widgets are not visible by default.
3 From your devices widget, select Connect IQ Store. 4 Select a Connect IQ feature, and download it. 5 Follow the on-screen instructions. Wi‑Fi Connected Features The Forerunner device has Wi‑Fi connected features. The Garmin Connect Mobile app is not required for you to use Wi‑Fi connectivity. Activity uploads to your Garmin Connect account: Automatically sends your activity to your Garmin Connect account as soon as you finish recording the activity.
Select to manage content from third-party providers. Select to switch between playing audio from the device and controlling music on a connected smartphone. When playing audio from the device, select to browse the available audio files and playlists in your library. Select to adjust the volume. Select to play and pause the current audio file. Select to skip to the next audio file in the playlist. Hold to fast forward through the current audio file. Select to restart the current audio file.
Changing Your Garmin Pay Passcode Using the Odometer You must know your current passcode to change it. Your passcode cannot be recovered. If you forget your passcode, you must delete your wallet, create a new one, and reenter your card information. You can change the passcode required to access your Garmin Pay wallet on your Forerunner device. 1 From the Forerunner device page in the Garmin Connect Mobile app, select Garmin Pay > Reset Passcode. 2 Follow the on-screen instructions.
Virtual Partner trying to complete the course in under 30 minutes. Plan your training: You can choose a fitness goal and load one of the day-by-day training plans. Track your progress: You can track your daily steps, join a friendly competition with your connections, and meet your goals. Share your activities: You can connect with friends to follow each other's activities or post links to your activities on your favorite social networking sites.
2 Select a category. 3 Respond to the on-screen prompts to choose a destination. 4 Select Go To. Navigation information appears. 5 Select START to begin navigation. Stopping Navigation 1 During an activity, hold UP. 2 Select Stop Navigation. Your device is compatible with the foot pod. You can use the foot pod to record pace and distance instead of using GPS when you are training indoors or when your GPS signal is weak. The foot pod is on standby and ready to send data (like the heart rate monitor).
5 Select an option: • Select Indoor when you are training with GPS turned off, usually indoors. • Select Always to use your foot pod data regardless of the GPS setting. Using an Optional Bike Speed or Cadence Sensor You can use a compatible bike speed or cadence sensor to send data to your device. • Pair the sensor with your device (Pairing ANT+ Sensors, page 19). • Set your wheel size (Wheel Size and Circumference, page 29). • Go for a ride (Starting an Activity, page 2).
6 Select an option: • Select Layout to adjust the number of data fields on the data screen. • Select a field to change the data that appears in the field. • Select Reorder to change the location of the data screen in the loop. • Select Remove to remove the data screen from the loop. 7 If necessary, select Add New to add a data screen to the loop. You can add a custom data screen, or select one of the predefined data screens.
NOTE: This feature is not available for all activities. 4 Select the activity settings. 5 Select Auto Pause. 6 Select an option: • To pause the timer automatically when you stop moving, select When Stopped. • To pause the timer automatically when your pace or speed drops below a specified level, select Custom. Using Auto Scroll You can use the auto scroll feature to cycle through all of the activity data screens automatically while the timer is running. 1 Hold UP. 2 Select Settings > Activities & Apps.
USB Mode: Sets the device to use mass storage mode or Garmin mode when connected to a computer. On a Forerunner 645 Music device, this sets the device to use Media Transfer Protocol (MTP) mode or Garmin mode when connected to a computer. Reset: Allows you to reset user data and settings (Resetting All Default Settings, page 26). Software Update: Allows you to install software updates downloaded using Garmin Express. Deleting an Alarm 1 From the watch face, hold UP. 2 Select Clock > Alarm Clock.
3 Wait while the device connects to your VIRB camera. 4 Select START. 5 Select an option: • To record video, select Start Recording. The video counter appears on the Forerunner screen. • To take a photo while recording video, select DOWN. • To stop recording video, select STOP. • To take a photo, select Take Photo. • To change video and photo settings, select Settings.
Forerunner 645 radio frequency/protocol 2.4 GHz @ 9 dBm nominal • ANT+ wireless communications protocol • Bluetooth 4.2 technology • Wi‑Fi wireless technology 13.56 MHz @ -40 dBm nominal, NFC wireless technology Forerunner 645 Music radio frequency/protocol 2.4 GHz @ 8 dBm nominal • ANT+ wireless communications protocol • Bluetooth 4.2 technology • Wi‑Fi wireless technology 13.56 MHz @ -40 dBm nominal, NFC wireless technology *The device withstands pressure equivalent to a depth of 50 m.
Synchronizing can take several minutes. NOTE: Refreshing the Garmin Connect Mobile app or the Garmin Connect application does not synchronize your data or update your step count. The floors climbed amount does not seem accurate Your device uses an internal barometer to measure elevation changes as you climb floors. A floor climbed is equal to 3 m (10 ft.). • Avoid holding handrails or skipping steps while climbing stairs.
• Use a Connect IQ watch face that is not updated every second. For example, use a watch face without a second hand (Customizing the Watch Face, page 22). • Limit the smartphone notifications the device displays (Managing Notifications, page 1). • Stop broadcasting heart rate data to paired Garmin devices (Broadcasting Heart Rate Data to Garmin Devices, page 9). • Turn off wrist-based heart rate monitoring (Turning Off the Wrist Heart Rate Monitor, page 9).
Cadence: Cycling. The number of revolutions of the crank arm. Your device must be connected to a cadence accessory for this data to appear. Calories: The amount of total calories burned. Compass Hdg.: The direction you are moving based on the compass. Course: The direction from your starting location to a destination. Course can be viewed as a planned or set route. You must be navigating for this data to appear. Dest. Location: The position of your final destination. Dest.
Lat/Lon: The current position in latitude and longitude regardless of the selected position format setting. Lengths: The number of pool lengths completed during the current activity. Location: The current position using the selected position format setting. Max. Ascent: The maximum rate of ascent in feet per minute or meters per minute since the last reset. Max. Descent: The maximum rate of descent in meters per minute or feet per minute since the last reset. Max.
Wheel Size L (mm) 24 × 2.00 1925 24 × 2.125 1965 26 × 7/8 1920 26 × 1(59) 1913 26 × 1(65) 1952 26 × 1.25 1953 26 × 1-1/8 1970 26 × 1-3/8 2068 26 × 1-1/2 2100 26 × 1.40 2005 26 × 1.50 2010 26 × 1.75 2023 26 × 1.95 2050 26 × 2.00 2055 26 × 2.10 2068 26 × 2.125 2070 26 × 2.35 2083 26 × 3.
Index A accessories 19, 25, 27 activities 2, 3, 20, 22 custom 3, 20 saving 2 starting 2 activity tracking 7, 8 alarms 21, 23 alert 4 alerts 21 ANT+ sensors 19, 20 pairing 19 applications 13–15 smartphone 1 Auto Lap 21 Auto Pause 21 auto scroll 22 B backlight 1, 23 bands 25 battery charging 24 maximizing 2, 22, 26 bike sensors 20 Bluetooth technology 1, 2, 4, 13, 26 headphones 16, 27 C cadence 6, 9 alerts 21 sensors 20 calendar 4 calorie, alerts 21 charging 24 cleaning the device 25 clock 1, 23 Connect IQ
Z zones heart rate 7 time 23 32 Index
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