Master under 100 GRT Practice Test

1. 1. At 1016 your position is LAT 41°07.6'N, LONG 71°38.5'W. At 1116 your position is LAT 41°01.4'N, LONG 71°29.4'W. What was the course made good between the two po...
2. 2. You are on course 056° per standard magnetic compass when you sight Block Island North Light in line with the Block Island Aero Beacon bearing 193° per standard...
3. 3. Your position is 3 miles due east of Montauk Point Light. What is the course to steer to arrive one mile due south of Block Island Southeast Point Light, if you...
4. 4. At 1103 you are in the entrance to Great Salt Pond on Block Island with buoy "5" close aboard. What is your ETA at light "1" at the mouth of the approaches to L...
5. 5. The Ruins (LAT 41°08.5'N, L0NG 72°08.8'W) is __________.

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1. 1. Which term defines the strainer at the bottom of a bilge suction pipe to prevent clogging?
2. 2. You are preparing to slush a stay on your vessel by lowering yourself down the stay in a bosun's chair. The proper way to do this is to ride down the stay on a...
3. 3. Using a safety factor of 6, determine the safe working load of manila line with a breaking stress of 8 tons.
4. 4. Which knot shown in the illustration represents a square knot?
5. 5. What is the name of the metal, teardrop-shaped object sometimes used within an eyesplice?

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1. 1. What does the gross tonnage of a vessel indicate?
2. 2. The water in which a vessel floats provides vertical upward support. Which term is regarded as the point through which this support is assumed to act?
3. 3. What will happen when cargo is shifted from the main deck into the lower hold of a vessel?
4. 4. The effect of free surface on initial stability depends upon __________.
5. 5. Which term is given to the difference between the starboard and port drafts caused by shifting a weight transversely in the vessel?

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1. 1. What must change for the compass deviation to change?
2. 2. Which is TRUE concerning compass error?
3. 3. The chart indicates the variation was 3°45'W in 1988, and the annual change is decreasing 6'. If you use the chart in 1991 how much variation should you apply?
4. 4. What is used to measure wind velocity?
5. 5. The needle of an aneroid barometer points to 30.05 on the dial. This indicates that the barometric pressure is __________.

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1. 1. At 0919 you are in Chesapeake Channel between Trestle B and Trestle C of the Chesapeake Bay Bridge and Tunnel. What is your ETA between York River Entrance Chan...
2. 2. While in the Back River, you sight the two tanks along the Northwest Branch (vicinity LAT 37°05.6'N, LONG 76°22.0'W) in line bearing 277° per standard magnetic...
3. 3. What correction should be applied to the charted depths of the Poquoson River at York Point at the PM low water on 18 December 1983?
4. 4. At 0856 your GPS position is LAT 37°01.6'N, LONG 75°31.7'W. At 0945 your position is LAT 36°57.0'N, LONG 75°41.0'W. What was the speed made good between the fix...
5. 5. Your GPS position is LAT 36°59.0'N, LONG 75°48.6'W. What is the course per standard magnetic compass to a position one mile east of Cape Charles Lighted Bell Bu...

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1. 1. At 2345, on 25 December, you depart Memphis Harbor, McKellar Lake (mile 726.0 AHP - LMR) enroute to the Petroleum Fuel & Terminal Co. (144.6 AHP) in Angelina, L...
2. 2. The highest point on your towboat is 67 feet above the water, and the Helena Gage reads +22.3 feet. What is the vertical clearance when you pass under the A-spa...
3. 3. Which of the following statements are TRUE?
4. 4. At 0509, on 26 December, you pass under the Helena Highway Bridge (mile 661.7 AHP). What has been the average speed of the current since departing Memphis Harbo...
5. 5. What is the distance in river miles, from the new mouth of the White River to the Petroleum Fuel & Terminal Co.(144.6 AHP)?

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