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Originally Posted by Peregrino
.... My preferred method for an extended surface swim is to shoot an azimuth, convert to a reciprocal heading, roll over on my back, put the compass on my chest, and read the heading through the sight glass/window. ..... NTM I HATE snorkels and will avoid using them whenever possible. FWIW - Peregrino
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Ditto to Peregrino also;
If the air runs out you are forced to the surface. Very relaxing to roll over on your back for extened swims. Keeps your face out of the water also.
Pete