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Ansar's compassesAnsar 1 compass shows same large digit on both tacks and is adjustable for tacking angle |
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| This compass helps the racing sailor by showing
the same large digit on opposite tacks. It is an
alternative to the Ansar 2 or 4 compasses in boats:
where no one can always reach the compass to adjust the
markers while sailing, for instance in a trapeze dinghy,
or in a boat (dinghy), where it is felt that reaching in,
from the hanging out position, would result in a too large
loss of way.
In preparation of tacking on oscillating wind shifts you sail to windward and note the indication of the compass for best lift on both tacks, let's say 3 on starboard tack and 4 on port tack. Then sailing on starboard tack with compass indicating 3 you sail in best lift, 3.5: in zero lift and 4: worst header. On port tack 4: best lift, 3.5: zero lift and 3: worst header. As you see here when sailing with a compass indicating numbers on one tack numbers decrease when reading improves. A complication you don't have with Ansar 2 and 4 compasses. The pictures shows the most sold model of this compass. The view is from behind and the starboard windward side, one cupola faces starboard and one port. It has one lubber line for each tack, some 45 degrees from the center line. It is the windward lubber line which is used. |
The compass is adjustable for different
tacking angles by turning the compass housing in its
fitting. This changes the distance between the slightly
inclined lubber lines.
The compass manufacturers Silva, Ritchie and Plastimo have copied this type of dial. These compasses are a not very useful as they can not be adjusted for tacking angle, which means it shows the same figure on opposite tacks only at one specific angle between tack. If you don't compensate for this there will sometimes be an error of up to 10 degrees - far too much as you usually are looking for shifts down to some 5 degrees. My concept can also be applied to compasses with other
orientations of the cupola: backwards slanted. For these
orientations Silva Compasses with letters B or NB in the
model number are modified. "It helped me to gain at least three or four places in each major regatta",
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Modified August 2011