Imagine Sailing along a coastline in your small sailboat. Fog, thicker than pea-soup or New England chowder cloaks your small sailboat beneath a shroud of mist. Shoals pockmark the sailing route to starboard. Discover two ways to use your GPS to avoid grounding or damage to your hull, keel, rudder or propeller.

Set a waypoint into your GPS to mark nearby navigational dangers. Your nautical GPS will allow you to scribe an electronic “circle” with a pre-determined radius. Enter this radius in tenths of a nautical mile. Touch the circle as you sail by and an alarm will sound.

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