English to Spanish Tech/Engineering Engineering (general) Center bearing line (radar)

Me encuentro con este término en el siguiente contexto:

(Fire control radar)

At High Speed Scan, when obtaining fire control data, the trainer trains the director on the target by centering the echo on the center bearing line of the Train Indicator. The radar bearing is then zero and the bearing of the target is the same as though the director were optically trained. To get the bearing of another echo, not on the center line, differences can be estimated, with the aid of the 5° bearing lines, and added to the director bearing.

Aguardo su ayuda.

Desde ya muchas gracias.