AG	Autopilot - General
AP	Autopilot - Magnetic
CC	Commputer - Programmed Calculator (outdated)
CD	Communications - Digital Selective Calling (DSC)
CM	Computer - Memory Data (outdated)
CS	Communications - Satellite
CT	Communications - Radio-Telephone (MF/HF)
CV	Communications - Radio-Telephone (VHF)
CX	Communications - Scanning Receiver
DE	DECCA Navigation
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
LA	Lorean A
LC	Lorean C
MP	Microwave Positioning System (outdated)
OM	OMEGA Navigation System
OS	Distress Alarm System (outdated)
RA	RADAR and/or ARPA
SD	Sounder; Depth
SN	Electronic Positioning System; other/general
SS	Sounder; Scanning
TI	Turn Rate Indicator
TR	TRANSIT Navigation System
VD	Velocity Sensor; Doppler; other/general
DM	Velocity Sensor; Speed Log; Water; Magnetic
VW	Velocity Sensor; Speed Log; Water; Mechanical
WI	Weather Instruments
YC	Transducer - Temperature (outdated)
YD	Transducer - Displacement; Angular or Linear (outdated)
YF	Transducer - Frequency (outdated)
YL	Transducer - Level (outdated)
YP	Transducer - Pressure (outdated)
YR	Transducer - Flow Rate (outdated)
YT	Transducer - Tachometer (outdated)
YV	Transducer - Volume (outdated)
YX	Transducer
ZA	Timekeeper - Atomic Clock
ZC	Timekeeper - Chronometer
ZQ	Timekeeper - Quartz
ZV	Timekeeper - Radio Update; WWV or WWVH