Definition
The reliability of a two-line fix depends on the angle between the lines. A cut near 90 degrees minimises the error ellipse, while a shallow cut converts a small bearing error into a large positional displacement along the bisector. For three objects, aim for roughly 60 degrees between adjacent bearings, spanning about 120 degrees of horizon. As a rule of thumb reject fixes where the cut falls below about 30 degrees unless nothing better is available.
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