Most modern MFD (multifunctional Displays) on boats can record your boat track via GPS whilst it moves along.
Turning this on allows you to see where you came into a tricky bay and follow the same course out, see if you are tracking around your anchor…. or away from it (Dragging), see where you anchored last time in this bay if you liked the position or holding, follow the same course through a tricky set of islands or rocks or make sure you DON’T if it got a little interesting last time.