the chart symbol and sound contact info default to merchant ship i think.
just an ice berg though... your sonar guy will hear it on hydrophones and just arbitrarily call it a merchant contact... of course if it is moving at 1 knot you can be pretty sure its an ice berg... couldnt hurt to take a listen either i guess.
nice find... some people sail their whole SH3 careers and never run across an ice chunk
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