Heckler & Koch GMG Automatic Grenade Launcher, W85 heavy machine gun, SLNS Sayurala (Sinhala: සයුරළ) pennant number P623 (Sayurala, in English: Sea Waves) is the flagship and an advanced offshore patrol vessel (AOPV) of the Sri Lanka Navy.

In February 2014 contract was signed by Government of Sri Lanka and Goa Shipyard for the two Advanced Offshore Patrol Vessels (AOPVs) for the Sri Lanka Navy and the production of the first AOPV began on 15 May 2014.

The Keel of the vessel was laid on 10 September 2014 and was ceremonially launched on 10 June 2016.

[3][clarification needed] As its first deployment Sayurala took part in Southeast Asian Nations (ASEAN) International Fleet Review 2017 in Thailand.

This is the longest foreign tour (21 days) an SLN Ship undertook after the year 1965 with 127 sailors including 18 officers.