Note link just below if you don't get an answer. My home page magazine articles, lectures. Anders Ansar, Kungsholms Str. Modified September 2000. You are visitor number 233 since Sept. 2000.
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This compass helps the racing sailor by showing the same large digit on opposite tacks . 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. 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.