Suunto AMBIT2 R 2.0 User Manual page 86

2. Press [Back Lap] to lock the current degree displayed on the
watch as your bearing.
3. An empty triangle indicates the locked bearing in relation to the
North indicator (solid triangle).
4. Press [Back Lap] to clear the bearing lock.
2.
273˚
NW
4.
273˚
NW
NOTE: While using the compass in an exercise mode, the [Back
Lap] button only locks and clears the bearing. Exit the compass view
to make a lap with [Back Lap].
86
3.
273˚
NW