Also, kind of intrigued by how these devices work...

If I were to walk out onto the beach and plot a point of interest with a GPS plotter, and the following year I walked back out on the beach to that exact specific point,

will the coordinates displayed on the unit be the same as the previous year (and display the point of interest)

--OR--

Will the coordinates on the unit be different... (give or take X amount of metres) a.k.a. if i stand X feet to the right of the exact point it will diplay same coordinates as the previous year