I'm thinking about buying a K5 system but have a question. Is it necessary to hook up the GPS unit for the camera system to work? I've read on these forums a number of people saying that getting the GPS unit to work has been problematic. I'll be mounting this system onto a 2020 Harley Limited, and don't want to mount the GPS unit out in the open. Will it work under the lid of the Tour-Pak which is fiberglass? If not, can I operate without the GPS?