Ulalu Island is a small island located at roughly the center of Truk Lagoon in Chuuk State (Truk) in the Federated States of Micronesia. To the southeast is Udot Island. To the southwest is Tol Island.
The Japanese installed three three (RDF) Radio Direction Finder station near the center of the island, for aircraft flying to the area. This station was manned by 68 men of the 4th Communications Unit. Also. 4th Civilian Engineer Department based 227 men and 40 Army personnel.
WWII Wrecks of Truk Lagoon page 80
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January 11, 2018