Hand held GPS
Redundancy is good in boating so get another GPS as a backup or primary.
Like Jeff H I have a nine year old GPS 12 that satisfies me but my old Loran still works so that''s my back up.
I like the handheld units over fixed ones as I can get under the dodger in the sun or rain or move back and forth on tacks and still check the GPS.
I would call Garmin on the phone and start out sweet asking for some help on your 76. If they brush you off then post it up here.