Velocitek SC-1, Reference Manual

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Operating Modes 19
Tactical Compass Mode
When the SC-1 is in Tactical Compass
mode, it displays your heading
relative the wind direction stored on
the SC-1. When it is correctly
configured, the tactical compass will
show you the same numbers at
equivalent angles on both tacks.
This makes wind shifts easy to
identify. If you're trimming by your
telltales and you start seeing smaller
numbers on the tactical compass
display you know that you have been
lifted, regardless of which tack you
are on.
Once you have identified a wind shift
using the SC-1's tactical compass
mode, you can adjust the reference
wind direction to account for the shift
without leaving the tactical compass
mode. Both the process of setting
the reference wind direction and the
process of identifying and adjusting to
wind shifts are outlined below.
In tactical compass mode the "COMPASS" and "VMG" indicators are displayed simultaneously.