Shri Ram had worshipped all nine planets (Navgraha) to keep Shani Dev (Satrun) calm at this place called Devi Pattanam.
Here, Shri Ram had also worshipped the chakra of Lord Vishnu and got the blessings for his Vanar army so as to they are not disturbed by the waves of the ocean.
Valmiki Ramayana 7/4/108 to 121 Manas 5/35/2 to 5/34/ chhand 2
