I own one and used it on a recent 35 nm day trip to move our boat from a private slip to a new marina.
I have used it with the navionics
iPad app on an iPad mini retina (non-cell) and an iPad 2. I leave it hanging with the neck strap around the grab handles of the companionway
. It did a great job with the built in tracking. Could even see where we got stuck and had to kedge off coming out of the creek where our old slip was.
We were forced to motor
all day and I left it on the whole day from 10am-6:00pm. We left the dock
at 10 and I forgot to turn it off once we got to the new slip so it stayed on logging the entire time. It still had probably 3/4 of its battery
life. Transferring the track to the badelf app on my iPad was seamless. As was sharing it via kml and gpx to some friends. It charges via usb which is easy enough.
I would buy another one in a heartbeat. By the way, Amazon was much cheaper than the manufacturer site.