Here's a bit of "old-school" navigation that might come in very handy if your GPS or Phone dies... It's the Davis Instrument HAND BEARING COMPASS and dates to the 1970's. Designed for "Yachtsmen, Fishermen, Divers for Position Finding, Steering and Navigation... It consists of a oil-filled Compass mounted on a black plastic pistol-grip handle with a clear plexiglass sighting device attached.  Includes the instruction booklet, lanyard and original box.  Looks like it was never or very little used.  Works perfectly.   GUARANTEED TO PLEASE THE NEW OWNER OR I'LL BUY IT BACK.  Check my Feedback.