Worksheet 191 · Skill 5

Set and drift

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1. At 1455 your fix is 015°T, 2.8 nm from Westfield church spire. You steer 169°T at 5.9 kn through the water. At 1530 a new fix puts you 068°T, 1.9 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0955 your fix is 082°T, 2.7 nm from Tern Island tower. You steer 304°T at 6.6 kn through the water. At 1025 a new fix puts you 353°T, 2.6 nm from Tern Island tower.

   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  

3. At 1540 your fix is 025°T, 1.2 nm from Westfield church spire. You steer 144°T at 6.8 kn through the water. At 1615 a new fix puts you 021°T, 2.7 nm from Heron Point Light.

   Plot the 1615 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  

4. At 1230 your fix is 014°T, 3.5 nm from Westfield church spire. You steer 099°T at 6.6 kn through the water. At 1330 a new fix puts you 300°T, 1.6 nm from Tern Island tower.

   Plot the 1330 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1345 your fix is 300°T, 1.4 nm from Tern Island tower. You steer 230°T at 4.0 kn through the water. At 1430 a new fix puts you 083°T, 2.5 nm from Westfield church spire.

   Plot the 1430 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 1015 your fix is 156°T, 1.7 nm from Westfield church spire. You steer 054°T at 6.8 kn through the water. At 1100 a new fix puts you 279°T, 3.0 nm from Tern Island tower.

   Plot the 1100 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  

7. At 1520 your fix is 004°T, 2.7 nm from Westfield church spire. You steer 082°T at 5.2 kn through the water. At 1600 a new fix puts you 304°T, 4.1 nm from Tern Island tower.

   Plot the 1600 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 1010 your fix is 050°T, 3.9 nm from Westfield church spire. You steer 157°T at 4.8 kn through the water. At 1120 a new fix puts you 349°T, 3.0 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn