You can use Applied Ballistics^® devices, such as rangefinders or wind sensors, and view additional ballistics information on your watch.

You can use Approach^® CT10 golf club sensors to automatically track your golf shots, including location, distance, and club type.

Allows you to receive data from a compatible handheld dog tracking device.

You can use your watch with your eBike and view bike data, such as battery and shifting information, during your rides.

You can use the Extended Display mode to display data screens from your D2™ Mach 1 watch on a compatible Edge^® bike computer during a ride or triathlon.

You can use an external sensor, such as the HRM-Pro™ series or HRM‍-Fit™ heart rate monitor, to view heart rate data during your activities. Some heart rate monitors can also store data or provide advanced running data (Running Dynamics) (Running Power).

You can use a foot pod to record pace and distance instead of using GPS when you are training indoors or when your GPS signal is weak.

You can use Bluetooth headphones to listen to music loaded onto your D2 Mach 1 watch (Connecting Bluetooth Headphones).

The inReach^® remote function allows you to control your inReach satellite communicator using your D2 Mach 1 watch (Using the inReach Remote).

You can use Varia™ smart bike lights to improve situational awareness.

You can use a muscle oxygen sensor to view hemoglobin and muscle oxygen saturation data while you train.

You can play video games on your computer and see real-time statistics on your device (Using the Garmin GameOn App).

You can use the Rally™ or Vector™ power meter bike pedals to view your power data on your watch. You can adjust your power zones to match your goals and abilities (Setting Your Power Zones), or use range alerts to be notified when you reach a specified power zone (Setting an Alert).

You can use a Varia rearview bike radar to improve situational awareness and send alerts about approaching vehicles. With a Varia radar camera tail light, you can also take photos and record video during a ride (Using the Varia Camera Controls).

You can use a Running Dynamics Pod to record running dynamics data and view it on your watch (Running Dynamics).

You can use electronic shifters to display shifting information during a ride. The D2 Mach 1 watch displays current adjustment values when the sensor is in adjustment mode.

You can use Shimano^® Di2™ electronic shifters to display shifting information during a ride. The D2 Mach 1 watch displays current adjustment values when the sensor is in adjustment mode.

You can use your watch with an indoor bike smart trainer to simulate resistance while following a course, ride, or workout (Using an Indoor Trainer).

You can attach speed or cadence sensors to your bike and view the data during your ride. If necessary, you can manually enter your wheel circumference (Wheel Size and Circumference).

You can attach the tempe™ temperature sensor to a secure strap or loop where it is exposed to ambient air, so it provides a consistent source of accurate temperature data.

You can use your device as a remote control for your Garmin trolling motor (Pairing Your Watch and Trolling Motor).

You can use Vectronix^® rangefinders, and view additional ballistics information on your watch.

The VIRB^® remote function allows you to control your VIRB action camera using your watch (VIRB Remote).

You can view and share laser location information from a Xero^® device (Xero Laser Location Settings).