USS Portland HYDRA System

https://en.wikipedia.org/wiki/USS_Portland_(LPD-27)

Here is a rundown of the Portland HYDRA shipboard trunked system:

USS Portland (LPD-27)
EDACS Wide-band 

System ID – 003

397.2625         LCN-3

397.6125         LCN-5

397.7625         LCN-6

399.1625         LCN-7

399.3125         LCN-8

399.5625         LCN-9

399.7625         LCN-10

LCN-1 and LCN-2 were showing as part of the system, but were not active, so I could not confirm the frequencies. There was no LCN-4 showing.

Dockside security was using 395.2500, N293 and 398.6500, N293 for simplex communications.

   And one item that came via “close-call” near field monitoring, a UHF air band beacon on 313.6250 MHz. It was a continuous AM carrier with Morse characters “A-I-A” being send every 10 seconds. My assumption is since this vessel handles helicopters and tilt-rotor aircraft, a navigation/homing beacon to the ship would be a must. But I was also told by a friend who spent time in the US Navy that all Navy vessels carry such beacons.