This is a check of the depth of the platform to which the Link, UNKNOWN contact is transmitted.
For ships and aircraft, the depth of which is undoubtedly higher than -1 meter, the link will be transmitted in any case.
For submarines, there will be a depth check of the floating wire or radiomast (if without float wire).
Loading into the FPU in this case is not required.
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Only the dead have seen the end of the war.
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