Yeah, i agree with you.
They should have either not integrated it with the house system ONLY....or perhaps given an option form the helm to engage the house batteries.
I discovered mine the same way not long after buying. I got in to drive it to the storage lot just down the road. Had to pull over to get it going.
I also don't like that I have to go into the settings every time I store the unit to reconfigure the polarity for the camera to come on automatically when I change gears to R. That camera thing should just come on when i shift to R. Simple
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