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Samsung SmartThings on board
I have found the Smart Home devices also work well on my boat. You can control door access and many other devices if you have a Wifi connection.
Even without an on board SmartThings Hub and Wifi you can use a Samsung SmartThings Tracker to always know where your boat is from your Smartphone App. The first year of LTE coverage is included and thereafter it is $5./month. That is a bargain compared to alternatives. It retails for $99. But you can find it for closer to $60.
Thanks, Brian! Home monitoring is a very confusing area, I find, and more so when you try to put it on a boat. But SmartThings definitely looks interesting when I see how far it can extend, like here...
The tracker too: