Well you got to be careful. If your contact is a stationary contact, like a tree or a lighthouse then yes that is true. Which of course is how you determine a "fixed position" on the map when you are close to shore and know a position or can very closely estimate a position such as a lighthouse or part of a port. You get two or 3 lines of bearing which are just straight lines taken at a different time and where they line up is where the object is, and therefore you can infer where your position was at one time from that. Much more accurately than even celestial navigation which will calculate you down to the nearest 1-10km in the best of situations. Position fixing by known navigation points will take you down the nearest 10-100m in the best of situations.
If your contact is moving either in a steady course or in a random or semi-random course it will be impossible to plot the position exactly using just these observations. Also the target could or may be changing speed. Which could also throw off your calculations.
Im going in game to make a better graphical example.
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