Worksheet 374 · Skill 5

Set and drift

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1. At 1510 your fix is 248°T, 3.6 nm from Tern Island tower. You steer 008°T at 5.1 kn through the water. At 1555 a new fix puts you 044°T, 4.1 nm from Westfield church spire.

   Plot the 1555 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  

2. At 1030 your fix is 252°T, 1.6 nm from Tern Island tower. You steer 308°T at 5.1 kn through the water. At 1105 a new fix puts you 275°T, 3.1 nm from Tern Island tower.

   Plot the 1105 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 1035 your fix is 042°T, 2.5 nm from Mill stack. You steer 338°T at 4.7 kn through the water. At 1125 a new fix puts you 260°T, 3.6 nm from Tern Island tower.

   Plot the 1125 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  

4. At 0730 your fix is 051°T, 2.6 nm from Tern Island tower. You steer 270°T at 5.6 kn through the water. At 0800 a new fix puts you 348°T, 2.6 nm from Tern Island tower.

   Plot the 0800 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 1505 your fix is 009°T, 2.4 nm from Tern Island tower. You steer 116°T at 5.9 kn through the water. At 1545 a new fix puts you 062°T, 3.3 nm from Tern Island tower.

   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  

6. At 0920 your fix is 243°T, 2.6 nm from Tern Island tower. You steer 325°T at 7.3 kn through the water. At 0950 a new fix puts you 305°T, 4.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1530 your fix is 028°T, 3.5 nm from Westfield church spire. You steer 087°T at 7.1 kn through the water. At 1640 a new fix puts you 067°T, 5.2 nm from Tern Island tower.

   Plot the 1640 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1440 your fix is 319°T, 2.7 nm from Tern Island tower. You steer 253°T at 6.4 kn through the water. At 1515 a new fix puts you 069°T, 2.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn