The Royal Australian Navy’s (RAN) navigation training vessel, Merchant Vessel (MV) Mercator, is a modified Pacific Class Patrol Boat. Purpose built for navigation training by Tenix Marine in Western Australia, she was launched in October 1998 to replace the aging Attack Class Patrol Boat HMAS Ardent.

Homeported at HMAS Waterhen in Sydney Harbour, she provides training to officers and sailors in coastal navigation, ship handling and watch keeping procedures. She is also utilised to assist Major Fleet Units (MFU) with boarding party training.

Type Modified Pacific patrol boat
Role Navigation training
International callsign VHN8774
Home port HMAS Waterhen
Builder Tenix Ship Building WA
Launched 15 October 1998
Displacement 165 tons
Length 31.5 metres
Beam 8.21 metres
Draught 2.6 metres
Speed 16 knots
Range 2,880 NM at 8 knots
  • 8 civilian crew
  • Up to 20 RAN trainees and staff
Machinery 2 Caterpillar diesels


Modified pacific patrol boat