Check in from the water
How the water looks from where you are standing, in the minute you are standing in it. First, which water: your phone can find the nearest, or type its name.
A check-in is a report. It gets a page, it can be commented on and flagged, and it counts as one of the reports you may file in a day. Nothing about where you are standing is kept: the water and, if you choose one, the reach are the finest places anything on this site points at.