AG Autopilot - General
AP Autopilot - Magnetic
CD Communications – Digital Selective Calling (DSC)
CR Communications – Receiver / Beacon Receiver
CS Communications – Satellite
CT Communications – Radio-Telephone (MF/HF)
CV Communications – Radio-Telephone (VHF)
CX Communications – Scanning Receiver
DF Direction Finder
EC Electronic Chart Display & Information System (ECDIS)
EP Emergency Position Indicating Beacon (EPIRB)
ER Engine Room Monitoring Systems
GP Global Positioning System (GPS)
HC Heading – Magnetic Compass
HE Heading – North Seeking Gyro
HN Heading – Non North Seeking Gyro
II Integrated Instrumentation
IN Integrated Navigation
LC Loran C
P Proprietary Code
RA RADAR and/or ARPA
SD Sounder, Depth
SN Electronic Positioning System, other/general
SS Sounder, Scanning
TI Turn Rate Indicator
VD Velocity Sensor, Doppler, other/general
DM Velocity Sensor, Speed Log, Water, Magnetic
VW Velocity Sensor, Speed Log, Water, Mechanical
WI Weather Instruments
YX Transducer
ZA Timekeeper – Atomic Clock
ZC Timekeeper – Chronometer
ZQ Timekeeper – Quartz
ZV Timekeeper – Radio Update, WWV or WWVH
AP Autopilot - Magnetic
CD Communications – Digital Selective Calling (DSC)
CR Communications – Receiver / Beacon Receiver
CS Communications – Satellite
CT Communications – Radio-Telephone (MF/HF)
CV Communications – Radio-Telephone (VHF)
CX Communications – Scanning Receiver
DF Direction Finder
EC Electronic Chart Display & Information System (ECDIS)
EP Emergency Position Indicating Beacon (EPIRB)
ER Engine Room Monitoring Systems
GP Global Positioning System (GPS)
HC Heading – Magnetic Compass
HE Heading – North Seeking Gyro
HN Heading – Non North Seeking Gyro
II Integrated Instrumentation
IN Integrated Navigation
LC Loran C
P Proprietary Code
RA RADAR and/or ARPA
SD Sounder, Depth
SN Electronic Positioning System, other/general
SS Sounder, Scanning
TI Turn Rate Indicator
VD Velocity Sensor, Doppler, other/general
DM Velocity Sensor, Speed Log, Water, Magnetic
VW Velocity Sensor, Speed Log, Water, Mechanical
WI Weather Instruments
YX Transducer
ZA Timekeeper – Atomic Clock
ZC Timekeeper – Chronometer
ZQ Timekeeper – Quartz
ZV Timekeeper – Radio Update, WWV or WWVH