- point N1 - the starting point, fixed on the ground;
- point N2 - the point of installation of the spetsteodolite, fixed on the ground by a geodetic sign;
- point N3 - the point of installation of the elektronic orientation, fixed on the ground by a geodetic sign;
- n - angle between the main firing direction and the line connecting points N1 and 2;
- Аон - orientation azimuth;
- ONS is the main shooting direction;
- HE is the target direction;
- NS is the true meridian direction;
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