Installed this spring, worked fine. Tried to update to V1.460, restorimg defaults first per instuctions. Unit locked up, showing "shutting down" screen. I sent it in to HB and they repaired and updated it under warranty. Now it does not save waypoints properly. When I push the mark button, it shows a new waypoint, displayed as a blue dot. Each waypoint has a new consecutive number (I'm up to WP016). But once the unit is turned off and back on, no waypoints are visible on the screen. In the waypoint management dialog box, no waypoints are shown, yet each time I mark a waypoint, it is displayed on the chart screen and the number is incremented. I've gone through all the waypoint management options and can't figure out a solution. I suspect I'll have to send it back to HB, but don't want to do that again until winter.