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RK--thanks for the advice not to disconnect the head unit. I've got an HB 597ci DI combo with GPS. nice unit. I now only disconnect the head on land after fishing--still a pain (very tight) to remove. I connect the battery on land before I fish, and disconnect afterwords. Pretty straightforward.
If "hardwired", then won't an in-line "off-switch" solve your problem?
The DI (down imaging) is a bit of an overkill, but I like the fine resolution it provides. Helps you learn what the sonar is telling you. Grass and ropes and trees and bushes look like themselves, not blobs.
But I son't appreciate the color yet. Perhaps I should try turning fish ID off, since the fish logos obscure the actual colored arc. But again, other than bait balls, versus kelp versus "a fish", which I could already see with grayscale, I don't really know what the color adds. Maybe someone can post a tutorial (or point to a link) on what color tells you with our local ocean and bay fishery. I also like its very high resolution.
FYI. I recently installed and tested a grease mount. It performed very well. It showed stuff in 120 feet of saltwater that I've never seen before. Used SuperLube, which some one else had suggested. It appears to be about the consistency of the lube provided by Humminbird in their in-hull mounting kits. I tried eco-friendly lithium grease from West Marine, but it was very thick and tended to get chunky.
I simply used foam to create a tight-fitting well for the transducer. Gooped it down. Coated the well bottom and transducer bottom and sides of transducer with thin layer of Superlube. Inserted transducer into the well, push down, jiggle. Press down with a plug of foam. I might glue velcro to the sides of the foam well to allow me to run a velcro strap over the foam plug to hold it in place. Signal is as good as when I hang the transducer over the side of the yak!!
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