Suunto TRAVERSE series User Manual page 64

When stationary or moving slowly (<4 km/h), the watch shows you the
direction to the POI (or waypoint if navigating a route) based on the
compass bearing.
While moving (>4 km/h), the watch shows you the direction to the POI
(or waypoint if navigating a route) based on GPS.
The direction to your target, or bearing, is shown with the empty
triangle. Your direction of travel, or heading, is indicated by the solid
lines at the top of the display. Aligning these two ensures you are
moving in the correct direction.
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