SUUNTO Vyper Air - Manual (Page 79)

BY PRESSING THE SELECT BUTTON DURING A DIVE, A BOOKMARK
IS WRITTEN IN THE PROFILE MEMORY, THE DIVE TIMER IS RESET,
AND THE PREVIOUSLY-TIMED INTERVAL IS DISPLAYED BELOW.
Tank pressure (if enabled) is also displayed during the dive.
NOTE
The GAUGE mode does not provide decompression information.
NOTE
There is no ascent rate monitoring in the GAUGE mode.
NOTE
If you dive with the GAUGE mode, it is not possible to change
between the modes before the no fly time has counted down.
79