wrist gps, Garmin 76 taped to the boom (in a drybag), and another 76 in another drybag in a trampoline pocket. A tactic solar digital compass on the pole.

On a long day, turn the gps units off (yes, even your primary) until you need them....no point in having them on while sailing along coastline and you know you're hours away. On open ocean, use the compass, check the gps periodically to refresh you bearing. Changing batteries is a painful exercise.