On Mar 15, 3:52 am, jeff wrote:
... between two objects. ...
Traditionally, a horizontal sextant sight is taken. This can give a
high degree of accuracy. Until recently, such sights were the primary
technique for positioning buoys.

That's not less than three, (3), (...---), (2+1), etc. objects for
horizontal angles not in transit to get a fix. That's why they
have three armed protractors.

-- Tom.