Hello, To map dowse with an L-rod is awkward. First you must learn to get yes and no answers with the L-rod. After that you simply lay a straight edge on the map and ask is the line laying over the treasure. You will get many no answers before you get a yes answer. Once you have the first line mark it on the map and then lay the edge perpendicular to the first line and begin seeking the second line. On a 1:24000 scale map the area covered by a sharp pencil where the two lines cross will be a circle on the ground at least 50 feet in diameter. That's not a limitation of dowsing that is a limitation of the mapping process. Rarely find smaller scales in the US not sure what's available in europe but the smaller the scale the better. On a 1:24,000 scale map an inch is a mile. If you read french try to get the books of Henry de France and Abbe Mermet. If you read german get a copy of pendel und wunschelrute (?sp?). If you speak spanish there are some titles but they don't come to mind. There are also titles in italian. good luck and exanimo, ss