Worksheet 32 · Skill 5

Set and drift

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1. At 0720 your fix is 298°T, 0.8 nm from Gannet Rock daybeacon. You steer 245°T at 5.6 kn through the water. At 0800 a new fix puts you 332°T, 2.1 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0840 your fix is 026°T, 2.0 nm from Tern Island tower. You steer 161°T at 4.9 kn through the water. At 0910 a new fix puts you 008°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 0910 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 1330 your fix is 218°T, 2.1 nm from Tern Island tower. You steer 270°T at 5.5 kn through the water. At 1415 a new fix puts you 087°T, 1.7 nm from Westfield church spire.

   Plot the 1415 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  

4. At 1255 your fix is 273°T, 3.1 nm from Tern Island tower. You steer 154°T at 5.6 kn through the water. At 1330 a new fix puts you 005°T, 2.5 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0725 your fix is 340°T, 2.6 nm from Mill stack. You steer 343°T at 5.3 kn through the water. At 0820 a new fix puts you 027°T, 3.1 nm from Westfield church spire.

   Plot the 0820 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1440 your fix is 138°T, 1.4 nm from Gannet Rock daybeacon. You steer 041°T at 4.6 kn through the water. At 1520 a new fix puts you 057°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1520 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 1435 your fix is 008°T, 1.6 nm from Heron Point Light. You steer 351°T at 4.5 kn through the water. At 1505 a new fix puts you 096°T, 1.6 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1355 your fix is 014°T, 1.7 nm from Heron Point Light. You steer 071°T at 6.0 kn through the water. At 1440 a new fix puts you 184°T, 1.7 nm from Tern Island tower.

   Plot the 1440 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