Worksheet 825 · Skill 5

Set and drift

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1. At 0850 your fix is 353°T, 3.5 nm from Mill stack. You steer 342°T at 6.2 kn through the water. At 0920 a new fix puts you 286°T, 3.5 nm from Tern Island tower.

   Plot the 0920 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 1435 your fix is 312°T, 3.2 nm from Tern Island tower. You steer 220°T at 5.6 kn through the water. At 1525 a new fix puts you 004°T, 1.8 nm from Heron Point Light.

   Plot the 1525 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  

3. At 0750 your fix is 032°T, 3.8 nm from Westfield church spire. You steer 140°T at 5.0 kn through the water. At 0830 a new fix puts you 067°T, 3.2 nm from Westfield church spire.

   Plot the 0830 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 1045 your fix is 041°T, 2.8 nm from Westfield church spire. You steer 103°T at 8.1 kn through the water. At 1115 a new fix puts you 272°T, 2.7 nm from Tern Island tower.

   Plot the 1115 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 1430 your fix is 081°T, 1.2 nm from Westfield church spire. You steer 079°T at 6.6 kn through the water. At 1500 a new fix puts you 273°T, 2.1 nm from Tern Island tower.

   Plot the 1500 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 0940 your fix is 211°T, 2.0 nm from Gannet Rock daybeacon. You steer 317°T at 7.5 kn through the water. At 1010 a new fix puts you 244°T, 2.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1045 your fix is 193°T, 1.2 nm from Gannet Rock daybeacon. You steer 040°T at 8.7 kn through the water. At 1115 a new fix puts you 054°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1115 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  

8. At 1445 your fix is 265°T, 1.8 nm from Tern Island tower. You steer 231°T at 6.1 kn through the water. At 1530 a new fix puts you 059°T, 1.7 nm from Heron Point Light.

   Plot the 1530 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