Noun
HMTSS
Initialism of Her/Her Majesty's Tuvaluan State Ship. The designation of the sole Tuvaluan ship for sea patrol (the HMTSS Te Mataili).
The police have a Pacific-class patrol boat (HMTSS Te Mataili) provided by Australia in October 1994 under the Pacific Patrol Boat Programme for use in maritime surveillance and fishery patrol and for search-and-rescue missions. Source: Internet