The default setting for our GPS devices when recording is Adaptive. What this means is that, if you are traveling in a straight line without changing speed, it may not record unnecessary GPS data points where nothing changed. This minimizes the file size and maximizes battery life. The exception is if you are running sensors. Heart rate or power data tends to fluctuate enough that the device is going to sample more frequently.

If you want the device to sample more frequently because you're mountain biking, riding under tree cover, or riding a curvy road, you can manually change the device to always sample once per second. Here's how you do that...

1. Hold down the Menu button on your device for two seconds. Now the Menu and Lap buttons act as Up and Down buttons respectively.
2. Press the Menu/Up button once to navigate to Info.
3. Press Enter.
4. Press Lap/Down twice to navigate to GPS.
5. Press Enter.
6. Press Enter again to select GPS Mode.
7. Press Up or Down once to select 1 Second.
8. Press Enter.
9. Press the back button (upper left) three times until you've back out of the menu.