Cocked Hat
Principle: When bearings or position lines are only spread over 180 °, you are irremediably located outside the hat. However, if the bearings or position lines are spread over 360 °, then you will be located inside the hat.
- You can not under any circumstances be in the yellow common area, supported by the 3 bearings towards the beacons or stars
- You are located on a position line that bisects the angle adjacent to the common area
- You are also located on the position lines that bisect the opposite outer corners of the triangle
- The error is constant between the bearings
- You are finally aground…
On a 1:7,500,000 ocean chart, 5 nm error is about the thickness of a pencil line …