Worksheet 758 · Skill 5

Set and drift

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1. At 0900 your fix is 064°T, 2.6 nm from Heron Point Light. You steer 333°T at 4.4 kn through the water. At 0940 a new fix puts you 265°T, 3.6 nm from Tern Island tower.

   Plot the 0940 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 0825 your fix is 050°T, 3.1 nm from Tern Island tower. You steer 256°T at 6.5 kn through the water. At 0855 a new fix puts you 012°T, 1.5 nm from Tern Island tower.

   Plot the 0855 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  

3. At 1115 your fix is 218°T, 1.6 nm from Tern Island tower. You steer 192°T at 4.0 kn through the water. At 1155 a new fix puts you 014°T, 1.2 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1255 your fix is 271°T, 3.7 nm from Tern Island tower. You steer 143°T at 5.0 kn through the water. At 1345 a new fix puts you 022°T, 1.9 nm from Mill stack.

   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 1320 your fix is 258°T, 1.7 nm from Gannet Rock daybeacon. You steer 255°T at 8.5 kn through the water. At 1350 a new fix puts you 048°T, 1.4 nm from Heron Point Light.

   Plot the 1350 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 1405 your fix is 125°T, 1.0 nm from Westfield church spire. You steer 064°T at 5.1 kn through the water. At 1435 a new fix puts you 023°T, 3.1 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1410 your fix is 033°T, 2.4 nm from Heron Point Light. You steer 308°T at 4.0 kn through the water. At 1455 a new fix puts you 160°T, 1.3 nm from Westfield church spire.

   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  

8. At 1430 your fix is 338°T, 1.6 nm from Heron Point Light. You steer 015°T at 5.4 kn through the water. At 1505 a new fix puts you 079°T, 3.0 nm from Westfield church spire.

   Plot the 1505 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