Nautical Units
F_C_CBL2M
F_C_CBM2RT
F_C_KM2SM
F_C_KMPH2SMPH
F_C_M2CBL
F_C_M2NL
F_C_M2NM
F_C_M2SHOT
F_C_NL2M
F_C_NM2M
F_C_RT2CBM
F_C_SHOT2M
F_C_SM2KM
F_C_SMPH2KMPH