Worksheet 75 · Skill 5

Set and drift

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1. At 1410 your fix is 118°T, 1.6 nm from Tern Island tower. You steer 199°T at 6.0 kn through the water. At 1440 a new fix puts you 038°T, 2.4 nm from Mill stack.

   Plot the 1440 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  

2. At 1355 your fix is 294°T, 4.1 nm from Tern Island tower. You steer 181°T at 7.5 kn through the water. At 1440 a new fix puts you 094°T, 1.0 nm from Heron Point Light.

   Plot the 1440 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1355 your fix is 301°T, 2.0 nm from Kittle water tank. You steer 311°T at 5.4 kn through the water. At 1425 a new fix puts you 021°T, 2.5 nm from Mill stack.

   Plot the 1425 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  

4. At 1005 your fix is 348°T, 2.6 nm from Mill stack. You steer 014°T at 4.6 kn through the water. At 1035 a new fix puts you 235°T, 3.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1410 your fix is 117°T, 1.5 nm from Gannet Rock daybeacon. You steer 024°T at 4.4 kn through the water. At 1455 a new fix puts you 057°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1455 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0815 your fix is 304°T, 1.6 nm from Tern Island tower. You steer 232°T at 8.2 kn through the water. At 0845 a new fix puts you 107°T, 2.2 nm from Westfield church spire.

   Plot the 0845 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  

7. At 0735 your fix is 340°T, 1.9 nm from Heron Point Light. You steer 019°T at 5.5 kn through the water. At 0815 a new fix puts you 078°T, 2.3 nm from Westfield church spire.

   Plot the 0815 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 0830 your fix is 153°T, 1.6 nm from Westfield church spire. You steer 075°T at 8.9 kn through the water. At 0900 a new fix puts you 242°T, 3.2 nm from Tern Island tower.

   Plot the 0900 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