Suunto AMBIT3 RUN 2.0 User Manual page 23

To lock a bearing:
1. With the compass active, hold the watch in front of you and turn
yourself towards your target.
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.
1.
273 ˚
NW
(3.)
214
˚
SW
2.
273
˚
NW
4.
273˚
NW
3.
273
˚
NW
23