GPS Question

I have a lake near me that has recently been drained for renovation. They are placing a lot of structure in it now. My question is if I go out there with my GPS now and mark the structure when the lake is empty, when I come back and the lake is full (aprox 20ft higher) will the GPS take me to the right spot? Or will the position be off because of the elevation change? Serious replies only please. Thank you for any help.

Good question, this is all i could find.

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If you mark waypoints it isn’t based on elevation its longitude and latitude. Your GPS may store elevation, but that would certainly be a relative term, but not a variable in determining the waypoint.
Mark the spot, come back when water is higher and it will work.

Yes, the GPS positions will be accurate. Your position above a point on the Earth is your position above that point regardless of whether your feet are touching that point or if you’re floating 1000 feet directly above that point.

Grouse

I would say yes. I have been on rivers and lakes that the water level has varied by as much as 10 ft ( Missouri River) for one. Had no issues with waypoints. You should be fine. That would be awesome to be able to do that.

traumatized wrote:

if I go out there with my GPS now and mark the structure when the lake is empty

I like the way you think.

-J.

Are they fastening the brush piles down so they don’t move. On a lake here by me they put piles of trees on the ice weighted and cabled together. I marked the locations but when they sunk they moved some quite aways. Just let you know as they will float somewhat and move