Worksheet 320 · Skill 5

Set and drift

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1. At 0830 your fix is 026°T, 2.3 nm from Westfield church spire. You steer 078°T at 8.1 kn through the water. At 0910 a new fix puts you 345°T, 1.6 nm from Tern Island tower.

   Plot the 0910 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  

2. At 0940 your fix is 225°T, 3.1 nm from Tern Island tower. You steer 304°T at 5.3 kn through the water. At 1025 a new fix puts you 074°T, 2.1 nm from Westfield church spire.

   Plot the 1025 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 1025 your fix is 065°T, 3.2 nm from Westfield church spire. You steer 131°T at 4.3 kn through the water. At 1100 a new fix puts you 259°T, 3.0 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0905 your fix is 036°T, 4.7 nm from Gannet Rock daybeacon. You steer 176°T at 4.9 kn through the water. At 0950 a new fix puts you 105°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0950 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  

5. At 0830 your fix is 019°T, 0.8 nm from Kittle water tank. You steer 282°T at 7.6 kn through the water. At 0910 a new fix puts you 020°T, 2.1 nm from Mill stack.

   Plot the 0910 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  

6. At 0720 your fix is 075°T, 3.2 nm from Tern Island tower. You steer 156°T at 4.8 kn through the water. At 0750 a new fix puts you 043°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 0750 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 1435 your fix is 212°T, 2.9 nm from Tern Island tower. You steer 270°T at 7.4 kn through the water. At 1515 a new fix puts you 114°T, 2.2 nm from Westfield church spire.

   Plot the 1515 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 0720 your fix is 124°T, 1.7 nm from Gannet Rock daybeacon. You steer 022°T at 7.1 kn through the water. At 0750 a new fix puts you 049°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 0750 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