CPC Subgroup
G01C 21/20 Instruments for performing navigational calculations (G01C21/24, G01C21/26 take precedence)
Full Title
Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 (measuring distance traversed on the ground by a vehicle G01C22/00; control of position, course, altitude or attitude of vehicles G05D1/00; traffic control systems for road vehicles involving transmission of navigation instructions to the vehicle G08G1/0968) > Instruments for performing navigational calculations (G01C21/24, G01C21/26 take precedence)
3 direct subcodes
Child Classifications
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- G01C 21/22 Plotting boards