Love knowing where my fleet boats are just by logging into the app on my phone. I run a sailing school, and sailboat rental. I used to have to wonder where the renter is, when I don't see the boat they rented back at the slip at the prescribed time. With this tracker, I can see how far out they are, etc. I can help them better if they get a bit lost and cannot find the correct marina to come back to. I also set a 'border' at the marina channel entrance so I get a text when a boat is leaving/entering the channel, in case I need to meet the boat at the dock, I have a notification for when I need to walk down to the slip. Battery lasts 2 days, maybe 3, but I just keep it charged so it doesn't die at an inconvenient time. I'll likely buy another for the busy season when I've got two boats out I want to know where they are. Right now I just put it on the boat that's going to be rented. I work at a mountain lake and the gps accuracy is still decent (occasionally shows the boat going over land, but that's rare). I got the 1min update, fine for sailboats that only go about 5, 6 mph �