I saw this post title
Then thought that I wish that I had not just had to treat the boat to a new set of batteries , as I was sure that JV would have had the AIS or a heater that I would rather have spent my money on.
But for JV a very modest investment [i added an identical one after parking in Ikea for the boat show] It works fine, matches the cabin colour scheme and has an alarm function.
You may need to add blue tac, as they weigh very little and keep falling over.
Charlie