Worksheet 480 · Skill 5

Set and drift

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1. At 1245 your fix is 328°T, 2.2 nm from Mill stack. You steer 303°T at 5.1 kn through the water. At 1325 a new fix puts you 332°T, 1.9 nm from Heron Point Light.

   Plot the 1325 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 0925 your fix is 135°T, 2.6 nm from Tern Island tower. You steer 034°T at 5.7 kn through the water. At 1000 a new fix puts you 043°T, 4.1 nm from Gannet Rock daybeacon.

   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 0830 your fix is 059°T, 4.4 nm from Tern Island tower. You steer 272°T at 7.3 kn through the water. At 0935 a new fix puts you 306°T, 2.3 nm from Tern Island tower.

   Plot the 0935 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  

4. At 1255 your fix is 061°T, 3.8 nm from Tern Island tower. You steer 204°T at 5.2 kn through the water. At 1345 a new fix puts you 134°T, 3.0 nm from Tern Island tower.

   Plot the 1345 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 1510 your fix is 056°T, 2.2 nm from Heron Point Light. You steer 107°T at 5.4 kn through the water. At 1540 a new fix puts you 243°T, 2.4 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0800 your fix is 055°T, 1.1 nm from Heron Point Light. You steer 355°T at 6.7 kn through the water. At 0840 a new fix puts you 062°T, 3.6 nm from Westfield church spire.

   Plot the 0840 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 1505 your fix is 232°T, 3.4 nm from Tern Island tower. You steer 137°T at 4.1 kn through the water. At 1545 a new fix puts you 010°T, 1.7 nm from Mill stack.

   Plot the 1545 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 0955 your fix is 261°T, 2.7 nm from Tern Island tower. You steer 217°T at 6.2 kn through the water. At 1025 a new fix puts you 042°T, 1.9 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn