Guides for DT 420 from Recta
Part of the instruction manual for the Recta DT 420 in English:
Decrease in azimuth of 20°. Fixed declination scale [3] When working in terrain, if the declination is different from zero, instead of being aligned between the N marks, the needle must point to the current declination on the fi xed declina - tion scale. The vertical intensity of the magnetic field, known as inclination, is not the same every where and this influences the horizontal posi tion of the needle. [4a ] However, RECTA compasses with the Global System function at all latitudes wit h out it being ne cessary to exchange the capsules. [4b ]...
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