The procedure is to determine three well-known landmarks confirmed by a chart that are less than 90 degrees apart in bearing. A benefit is this fix is accurate and does not rely on a compass. It is good from stationary positions or to see if you have dragged your anchor.

Steps:

1. Find three points on the horizon confirmed by a chart. From left to right points A, B, and C.
2. Take angles AB and BC from your boat with a sextant or kamal.
3. Draw a line from B to C on the chart.
4. Construct angle CBR on the chart = 90 - angle BC
5. Construct angle BCQ on the chart = 90 - angle BC
6. From the intersection of these lines, this equals S.
7. From this intersection draw circle with a radius SC on the chart.
8. The vessel is somewhere on that circle.
9. Construct angle BAR = 90 - angle AB
10. Construct angle ABQ = 90 - angle AB
11. From the intersection of these lines, this equals S.
12. From this intersection draw circle with a radius SB
13. Where the circles intersect is your fix.