410 Command & Control (Autopilots, etc.)
	420 Navigation (Compasses, GPS&Depth Sounders
	421 Non-Electronic Navigation
	Sextants
	422 Electronic Navigation
	GPS Palm W2K
	424 Electronic navigation Aids-Acoustic
	Depth Finders
	430 Interior Communications (intercoms, etc.)
	434 Training, Entertainment & TV Systems
	Direct TV
	440 Exterior Communications (Radios, Searchlights, etc.)
	441 Ham Antennas & Ham Radios
	Ham Antennas & Radios
	442 Exterior Communications - Cell Phones
	Cell Phones
	450 Radar
	460 Sonar
	490 Special Purpose Systems