For starter, clear out your pitot pickups with a small safety pin (or dental drill bit if you have one) and see if it works any better. As for the depth finder, I've got nothing. They don't work forever unfortunately.
Previous: 1993 Prostar 205
Red 1998 Closed Bow Ski Boat, PCM GT40, 310 hp, Standard Gear Reduction, Acme 4 blade, Perfect Pass SG/Zbox.
Tyler Ski Club
Be kind. Have fun.