Remember the fast method.
Note the RedLight BaseTime for Sun Set.
Wait for nightfall and sighting of Polaris.
Measure Polaris altitude (Hs)
Hs - 1 = Lattitude of your boat. (roughly but better then just the Hs)
From the Lat. look up SunSet in Van's Almanac.
Basetime Sunset is converted to GMT (for Pearl Harbor thats timezone X to GMT)
Difference in sunset is found and substracted/or added to the middle of your local timezone(you know aproximately how far you have traveled with speed over time at course)
Now you can plot your position at SunSet and extrapolate it with speedovertimeatcourse to your present position. Now stick a new course if necesary to reach your goal.
Do that every morning and evening and you will be safe. In the morning its the reverse order of course. First the polaris fix then the sun rise time.
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