USCG Master 100 case studies
USCG Master 100 · Put your knowledge to work in context.
The USCG Master 100 Gross Register Tons credential - commonly called Master 100 Ton or Master 100 GRT - is a merchant mariner officer endorsement that qualifies the holder to serve as master of inspected steam or motor vessels of not more than 100 gross register tons, subject to the limits and conditions printed on the credential itself. Candidates are typically owner-operators, charter and small passenger vessel captains, tug and workboat operators, and deckhands moving up from an Operator of Uninspected Passenger Vessel or mate-level endorsement. The USCG Master 100 case studies are 5 cases and about 1,754 words.
1Fog Meeting in a Traffic Lane
You are master of the 110-ft passenger vessel Harbor Queen, twin screw, making 9.0 kts on heading 180°T in a traffic lane. Visibility is 0.3 nm in fog; radar is operating.
424 words, about 2 min2Course to Steer with a Cross-Current
You are navigating a 20-nm leg to a waypoint that bears 090°T. Your vessel's speed through the water is 10.0 kts.
318 words, about 2 min3Loading a Deck Weight with a Slack Tank
Your 120-ft inspected vessel has displacement 250 long tons, KM 8.0 ft, and KG 7.2 ft. You plan to load a 20-long-ton deck package at a vertical center of gravity 12 ft above the keel.
327 words, about 2 min4Engine Room Fire and Fixed CO2
At 0230, 12 nm offshore, a 130-ft steel vessel is underway at 9 kts. Smoke is coming from the engine-room vents; a crew member reports flames near the port main.
346 words, about 2 min5Upbound Meeting at a River Bend
You are master of an 85-ft passenger vessel upbound on a river with a following current of 2.5 kts. Your speed through the water is 9.0 kts, giving 6.5 kts over ground.
339 words, about 2 min