It's basically same thing as when you use an arrival sensor in your car, some have the garage door open, unlock doors, turn up lighting etc. but with my boat.
I have a Samsung arrival sensor that I hacked and is pluged with a small dc-dc transformer on the boat batteries so I don't have to change that coin cell half way through the season. On my deck I already have a Zigbee device that also acts as a repeater. When I get home with the boat at night, the dock lights, some string lights near the dock and the backyard patio lights all come on or rise there brightness so that we can dock safely, unboard the boat and all. After a set time (unless I turn them off first) they all go back to the normal setting.
Now that these Samsung arrival sensors are almost impossible to find, check this thread out...
