Matt & Michelle Day, SM#208 SV Talia
Michelle and I will be doing something similar in the near future. In addition, I would like to add the ability to turn on the mizzen light on command as well, upon return to the boat.
We are looking at moving to a digital switch to perform both functions. With the digital switch we can use any marine light we want, and use a remote (key fob, garage door opener, etc) to carried with us on the dinghy. Simple tap into switched 12/24V, a little programming of the relay, and routing to device.
I think it cleaner than dealing with motion sensors on a moving vessel.