Worksheet 823 · Skill 5

Set and drift

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1. At 1330 your fix is 005°T, 1.8 nm from Mill stack. You steer 317°T at 4.9 kn through the water. At 1435 a new fix puts you 053°T, 1.1 nm from Westfield church spire.

   Plot the 1435 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1215 your fix is 322°T, 1.6 nm from Tern Island tower. You steer 280°T at 4.6 kn through the water. At 1320 a new fix puts you 035°T, 4.0 nm from Westfield church spire.

   Plot the 1320 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0830 your fix is 124°T, 2.0 nm from Westfield church spire. You steer 004°T at 5.2 kn through the water. At 0910 a new fix puts you 037°T, 4.2 nm from Westfield church spire.

   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  

4. At 1040 your fix is 007°T, 2.3 nm from Tern Island tower. You steer 245°T at 5.0 kn through the water. At 1120 a new fix puts you 277°T, 2.6 nm from Tern Island tower.

   Plot the 1120 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  

5. At 1045 your fix is 147°T, 1.4 nm from Tern Island tower. You steer 058°T at 5.2 kn through the water. At 1130 a new fix puts you 061°T, 4.1 nm from Tern Island tower.

   Plot the 1130 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 1435 your fix is 007°T, 2.1 nm from Westfield church spire. You steer 123°T at 5.4 kn through the water. At 1540 a new fix puts you 012°T, 2.7 nm from Mill stack.

   Plot the 1540 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0855 your fix is 059°T, 3.1 nm from Heron Point Light. You steer 074°T at 4.7 kn through the water. At 1010 a new fix puts you 107°T, 1.6 nm from Gannet Rock daybeacon.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 033°T, 4.0 nm from Westfield church spire. You steer 232°T at 5.6 kn through the water. At 1415 a new fix puts you 359°T, 1.2 nm from Westfield church spire.

   Plot the 1415 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