Worksheet 500 · Skill 5

Set and drift

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1. At 1225 your fix is 008°T, 2.1 nm from Heron Point Light. You steer 100°T at 6.1 kn through the water. At 1335 a new fix puts you 209°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1335 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0925 your fix is 025°T, 2.5 nm from Mill stack. You steer 329°T at 4.5 kn through the water. At 1000 a new fix puts you 229°T, 1.9 nm from Tern Island tower.

   Plot the 1000 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1040 your fix is 059°T, 2.2 nm from Gannet Rock daybeacon. You steer 266°T at 6.2 kn through the water. At 1155 a new fix puts you 066°T, 1.2 nm from Heron Point Light.

   Plot the 1155 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0915 your fix is 273°T, 2.3 nm from Tern Island tower. You steer 198°T at 5.4 kn through the water. At 1005 a new fix puts you 308°T, 1.6 nm from Mill stack.

   Plot the 1005 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0950 your fix is 029°T, 2.2 nm from Tern Island tower. You steer 261°T at 4.2 kn through the water. At 1100 a new fix puts you 271°T, 2.7 nm from Tern Island tower.

   Plot the 1100 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0930 your fix is 036°T, 2.2 nm from Tern Island tower. You steer 263°T at 6.0 kn through the water. At 1010 a new fix puts you 325°T, 2.1 nm from Tern Island tower.

   Plot the 1010 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0955 your fix is 161°T, 1.2 nm from Westfield church spire. You steer 101°T at 5.1 kn through the water. At 1035 a new fix puts you 050°T, 2.9 nm from Heron Point Light.

   Plot the 1035 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1455 your fix is 039°T, 2.9 nm from Gannet Rock daybeacon. You steer 198°T at 8.9 kn through the water. At 1525 a new fix puts you 290°T, 1.7 nm from Kittle water tank.

   Plot the 1525 DR, then find the current: set (the true direction the water moved you, from the DR to the fix) and drift (its speed in knots over the 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn