Yep owned one for the same reason to track spots and alarm before my plotter. Some handy manuals and tips on the Gramin website for that model. I am pretty sure the anchor drag alarm is in the marine settings. It would be as simple as dropping a mark on the spots you dropped your pots and you should be all good oh and unsure the track function is on. You have a defined distance before the track runs out but you should be sweet as it is a considerable distance.