When I remember to turn it on. I have been shutting it off when we are anchored. You can see our track at share dot delorme dot com slash jonfitch. I haven't used the SMS facility yet except to test that it works. With one hour ticks (seems to be enough for a slow monohull ) the battery easily lasts 4 or 5 days before needing a recharge. Zoom back and click on the blue ticks to see speed, direction, altitude, etc. The gaps are from me forgetting to turn it on as we get underway. The relatives love this thing.