The Thai government survey craft "Sămrùat 3" (สำรวจ ๓) is seen here underway off Samut Prakan, a location quite a distance from Bangkok close to the mouth of the Chao Praya River.
The vessel obiously is under control of the Marine Department, Ministry of Transport. The name "Sămrùat 3" (สำรวจ ๓) is to be translated as "Survey 3".