That really does sound like an elegant solution Quentin. A favor please? Hook it up and turn it on at home some night. I don't know what happened. I had the depth alarm set at 2 feet - hey, it wasn't my boat and I wanted to treat it nice. Perhaps I didn't press the off button for the full five seconds as I approached Jimbo's island. Thing is, I had three chances to turn the darn thing off and the pit of my stomach knew exactly what that beeping was as I approached the boat in the morning. Every other night I'd even remove a battery just to be sure so I blame Jimbo!   ;D

As a heavy user of finicky rechargeable nicads once upon a time, I actually almost wish my finder was set up with an integral battery compartment like my camera and cordless drill as I've been very impressed with lithium rechargeables in comparison.