How to make a compass with items you would find on Moreton Island?

I have this assignment, and its about being stranded on Moreton Island. All i have is a leather banded watch, my clothing, leather boots a tarp and a metal drink bottle.Plus the natural resources. It 1856, how do i make a compass

Holding your watch horizontally, point the numeral twelve on your watch at the sun. Note the direction that lies exactly midway between the twelve and the hour hand. This will be North on a north/south line. If in any doubt as to which end of the line is north, remember that the sun rises in the east, sets in the west, and is due north at noon.

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