I use Basecamp to prepare and load exactly the navigation information (tracks, waypoints, etc.) I will need for an excursion off the grid. In the event I later need to update InReach information, how do I sync it to the 66i without altering carefully prepared navigation information? An easy answer if I have my laptop, is to (1) copy the nav info to a Basecamp list, (2) sync the InReach info, (3) clear 66i internal storage and (4) copy the saved Basecamp list back onto the 66i. But I hope someone more familiar with collections management knows an easy more general procedure that would work with or without access to a computer.