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Old 06-12-2019, 03:52 PM
Quercus is offline
Join Date: Dec 2000
Location: temperate forest
Posts: 7,125
If you need to call in the morning (as the puzzle sort-of implies), then what's wrong with finding rough North by the movement of the stars, along with a rough latitude from the elevation of the center of movement; and calling at Sunrise to get a pretty good longitude, along with another rough latitude from the direction of sunrise?

In general, I'd consider calling at sundown instead, mostly so I could look around and see if there are any other islands visible, but also to get a more accurate latitude (mostly by getting a good east-west line from shadows, which will allow a more accurate bearing on sunset).

But even with the morning call, my rough estimate is that the longitude will be within 10 miles or so, and the latitude probably a couple hundred. Which, given that the search is for a clearly visible island, should be good enough, right?