Indonesia Indonesian Navy, Tentara Nasional Indonesia-Angkatan Laut (TNI-AL)

[Lordimperator]

What is that rotating radar?

my guess is Cenk S

 

[Umigami]

Also why we need that second mast there?

 

[Umigami]

Well, happy experimenting everybody...

 

[Anmdt]

What is that rotating radar?

CENK-S (CENK-400)
and there is MAR-D (CENK-200) on the secondary mast on the rear side, that serves as helicopter approach radar. So far TN's LST and DIMDEG utilizes MAR-D as helicopter approach radar and main volumetric search radar.