- 1920 - 1941 White Heather
- 1941 - 1946 HMS Manatee
- 1946 - 1950 White Heather
- 1950 Riis 1
Built in 1920 by McGruer & Co.Limited, Clynder, Dumbartonshire, RIIS I is a twin screw motor yacht of pitch pine over oak, with a carvel construction. She has twin Ford Thornycroft engines of 44.76 kw each, installed in 1973. She was originally registered in Glasgow, later moved to North Wales and thence to the South East of England where she has remained. As HMS MANATEE she saw significant service during World War II when she was used as a patrol boat and for special operations. She took part in Operation Dynamo and later in the St Valery landings. She was returned to her owner in 1946 and sold on to a private buyer. She is now based at West Mersea, Essex.
ADLS News: Ostend to Anchor, pp16-17, Spring 2015
Vessel selected for Avenue of Sail, Queen's Diamond Jubilee Pageant on 3 June 2012
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