Radio fix


In telecommunication and position fixing, the term radio fix has the following meanings:
Compare triangulation.

Obtaining a radio fix

A single transmitter can be used to give a line of position of the craft. The bearing to the station from the craft, TB or QUJ, is composed of the true heading, TH, plus the relative bearing, RB, of the station. The bearing from the station is found by adding 180° to the QUJ figure.
The line of position is then the line of bearing QUJ passing through the station.
For the diagram on the right, we have:
A radio fix on two stations can be found in exactly the same way. The intersection of the two position lines gives the position of the receiver. For the diagram on the right, the LOPs are found as before:
Remembering that the LOPs pass through their respective stations, it is now simple to find the location of the craft.
Remember too, that bearings and direction are given/recorded with respect to True North and to Magnetic North. Values used by mobile stations usually need to be converted from Magnetic to True..