A.4000Ft/sec B.500Ft/sec C.2000Ft/sec
A.±2° B.±0.5° C.±1°
A.地磁磁力線與水平面的夾角; B.磁北偏離真北的角度,偏東“+”,西“-”; C.真北與磁北的夾角,并標(biāo)出東“E”,西“W”.