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Security System Contender?
Eufy (Anker's electronics brand) has announced a kickstarter campaign for a new line of security cameras. These are similar to Logitech's Arlo line of cameras that have received some loving over at Sailbits
I realize this isn't a marine product but I suspect for many uses this would work well. I'm really liking the idea of the receiver hub in the boat with recording capabilities and no requirement for a cloud subscription. Not to mention $3 a month / camera if you chose to subscribe to cloud backup is awfully reasonable.
The 3 camera / 3 entry sensor option is kind of calling my name.