Triangulation - measure a known distance on pond edge and mark each end with stake - stake "new" points around bearings of two landmarks visible from where you are".
Geta flat surface drafting board with sheet of paper.
Use a ruler and plot original measured staked points on created "map" - stake new points around pont - triangulate intersectons and plot on map - connect the dots and you have a map.
Clear as mud?
Get out your old Boy Scout manual...

Read more: How to Triangulate a Position | eHow.com
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