The 3D Speed and 3D Distance features change the way outdoor watches read speed and distance by taking into account elevation changes when calculating distance and speed.
How do I make my Garmin more accurate?
3D Speed and Distance
From the watch face, press and hold Up/Menu to access the main menu.
Select Activities & Apps.
Select activity profile to be customized.
Select the activity settings.
Select 3D Speed and/or 3D Distance.
Press GPS to Enable.
3D Speed – Calculates speed using both the elevation change and horizontal movement over ground.
3D Distance – Calculates the distance traveled using both elevation change and horizontal movement over ground.
Enabling 3D Speed and 3D Distance improves speed and distance accuracy when doing activities with moderate to high elevation changes.
Enabling 3D Speed and 3D Distance
For more information on troubleshooting GPS, see the Related Content below.