Instruction manual

Operating Modes 20
Using the Tactical Compass to Identify Wind Shifts
The above sequence shows how you would use the SC-1 to identify a lift while sailing upwind on port
tack. The boat in the example sails at 40° to the wind when trimmed using telltales.
1 Imagine the wind clocking 25° to the left, lifting you on port tack and causing your leeward jib
telltale to flutter. While real wind direction has changed by 25° the reference wind direction
stored on the SC-1 remains unchanged.
2 Re-trim according to your tell-tales. In doing this you will head up until your boats real heading to
wind is 40°, the same as it was before the wind shift. At this point your indicated heading to wind
will only be 15° though because the reference wind direction stored on the SC-1 will still be aligned
with the pre-shift wind direction.
3 Increase your indicated heading back to its pre-shift value. In doing so you will be realigning the
reference wind direction stored on the SC-1 with the actual wind direction. This will prepare you
to spot the next wind shift.