I go back to the Periscope station and then into the Stadimeter station. Bringing up reference image of the cargo ship, I compare it to the picture I took with the periscope.
There is now no doubt, it is the cargo ship!
Aware that the Perry FFG has a MH-60R multi-mission helicopter I decide not to push my luck and I shelve the idea of using the ESM (Electronic Support Measures) to confirm via a radar signature that the platform pinging is in fact the Perry FFG.
Shortly after two sound contacts show up on the Broadband Sonar station, going to the Narrowband Sonar station I confirm that these are the cargo ship and the freighter I had previously sighted in the periscope. After marking the sound contacts off in the Broadband Sonar station the Navigational station is updated with the new contacts S04 & S05.
Knowing the identities of S04 & S05 from previous visual observations, I manually classify the contacts S04 as the cargo ship & S05 as the freighter.
Assuming that S03 is hostile, I mark it as a hostile surface ship but leave the identity as unknown.
Needing to know the identity of S03 I decide to use the ESM. Seconds after the ESM mast breached the surface it goes crazy. Checking each ESM contact I am rewarded with confirmation that S03 is a Perry FFG.
I mark off the contact on bearing 235 lowering the mast before I am detected.
I manually update S03 as a Perry FFG in the Navigation station.
The ESM contact at bearing 235 matches that of S04 and I decide to merge these into one contact through the TMA (Target Motion Analysis) station, the platform S04 is now has a new designation M01.
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