Straat Malakka

Some articles on straat malakka:

Battle Between HMAS Sydney And German Auxiliary Cruiser Kormoran - Battle - Identification
... Kormoran raised "PKQI"—the call-sign for the Dutch merchant ship Straat Malakka—on the triatic stay and hoisted a Dutch merchant ensign ... to send a false distress signal indicating that Straat Malakka was being approached by a suspicious ship ... The Germans were unaware that the letters were the interior of Straat Malakka's secret callsign, "IIKP" to verify her identity, the ship had to signal back the outer letters ...
HMAS Sydney (D48) - Final Battle and Loss
... The callsign was that of the Dutch ship Straat Malakka, but she was not on Sydney's list of ships meant to be in the area ... At 1700, a distress signal was transmitted by Straat Malakka, indicating that she was being pursued by a merchant raider ... while she sent the interior portion of Straat Malakka's secret callsign ...