Yes, you can record on both your smartphone and Garmin device at the same time. However, you must start a workout with the Hex on the mobile app first and not by directly pressing on the Hex button.
Use the following procedure to record on both your smartphone and Garmin simultaneously:
1. Pair your Hex to the Humon mobile app.
2. Start a workout as you normally would with the Humon mobile app. Once a workout is running the LED on the Hex will be blinking green.
3. Add the Humon data field to your Garmin screen and your Garmin device will automatically detect the signal from the Hex.
Note: If you try to start a workout directly from the Hex by double pressing on the Hex button, you will not be able to start recording from your smartphone. You will receive an error indicating that a workout is already recording.