Eyeball navigation
South coast of Anguilla - the water depths can be easily determined from the colors of the water
Augapfelnavigation in describing navigation the optical determination of the water depth on the basis of color shades.
With clean water and in shallow waters, the depth of the water can be determined with a bit of practice using shades of color to within half a meter. It is important in reef areas that the sun is high and behind the observer.
| colour | Depth in meters | reason |
|---|---|---|
| Yellow-brown | 2 | Corals, color depending on the species |
| Red-brown | 3 | Corals, color depending on the species |
| White | 4th | sand |
| Light green | 6th | sand |
| Brown black | 6th | rock |
| Brown Green | 10 | Rock, seaweed |
| green | 10 | sand |
| Dark green | 20th | rock |
| Light Blue | 20th | sand |
| blue | > 20 |
This type of navigation is not professional.
literature
- Patience Wales: The SAIL Book of Commonsense Cruising . Sheridan House, Inc., 2001, ISBN 1-57409-121-2 .