I have this underwater site I am treasure hunting. It is a sand lake bed in chest deep water. I need to scan every square inch of this lake bed with my detector because artifacts and treasure are there to find. I am scanning the lake bed with a coil that is 6" in diameter. What this means is I have to 'paint' the entire lake bed in the area with the 6" wide coil and, ideally, not miss any spots.
Last year, I dropped 2 floats in the water and tried to walk between them in straight lines to grid off the area. Then I would move the floats to cover the next area over. It worked, sort of, but I probably missed large areas. I was using a larger coil diameter (12") which allowed me to cover area faster, but was not as accurate as the smaller one I want to use this year.
Anyway. My brain storming question is... How can I temporarily mark guides on this area so I can cover every inch of it?
- There are no underwater landmarks at the site.
- Visibility in the water is not that great. Sometimes I can see the bottom, sometimes not (depends on winds and wave action).
- When I start digging up a promising signal, I stir up sediments that can also cloud the water.
- There is a gentle current and sometimes strong wave action that obliterates any footprints or holes previously made.
- My detector has a built in GPS that I can use to put pins into Google satellite maps, but GPS accuracy is only abut 3 meters, which is not good enough. .
Last year, I dropped 2 floats in the water and tried to walk between them in straight lines to grid off the area. Then I would move the floats to cover the next area over. It worked, sort of, but I probably missed large areas. I was using a larger coil diameter (12") which allowed me to cover area faster, but was not as accurate as the smaller one I want to use this year.
Anyway. My brain storming question is... How can I temporarily mark guides on this area so I can cover every inch of it?