I'm curious how many, if any, leave their electronics on board over winter? VHF, plotter/sounder, stereo, etc. I have my stuff flush mounted now, making it tedious for removal. I don't have a security problem. The way I see it, automotive electronics are left in the cold without issue. The Marine stuff should fare better as it's not being turned on and off, causing extreme temp changes, but that's just an opinion. Obviously transducers don't get removed but seem to tolerate the cold just fine, being ceramic and urethayne. The only real concern that comes to mind, might be an issue with a touch screen. I was late getting my stuff out last year and they saw some very cold temps for a bit. Didn't seem to bother them at this point.