Worksheet 144 · Skill 5

Set and drift

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1. At 1030 your fix is 048°T, 3.4 nm from Tern Island tower. You steer 160°T at 4.6 kn through the water. At 1110 a new fix puts you 059°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1110 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 0800 your fix is 227°T, 2.1 nm from Gannet Rock daybeacon. You steer 268°T at 6.0 kn through the water. At 0830 a new fix puts you 342°T, 2.1 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1145 your fix is 210°T, 3.2 nm from Tern Island tower. You steer 338°T at 5.6 kn through the water. At 1220 a new fix puts you 279°T, 2.5 nm from Tern Island tower.

   Plot the 1220 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 0820 your fix is 037°T, 1.8 nm from Westfield church spire. You steer 082°T at 4.5 kn through the water. At 0940 a new fix puts you 297°T, 1.3 nm from Gannet Rock daybeacon.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1550 your fix is 132°T, 1.4 nm from Tern Island tower. You steer 242°T at 4.0 kn through the water. At 1645 a new fix puts you 040°T, 3.4 nm from Heron Point Light.

   Plot the 1645 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 015°T, 2.1 nm from Mill stack. You steer 322°T at 5.8 kn through the water. At 1515 a new fix puts you 257°T, 3.6 nm from Tern Island tower.

   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  

7. At 0840 your fix is 333°T, 1.9 nm from Heron Point Light. You steer 010°T at 6.5 kn through the water. At 0910 a new fix puts you 052°T, 2.9 nm from Westfield church spire.

   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  

8. At 0735 your fix is 348°T, 2.6 nm from Mill stack. You steer 309°T at 6.2 kn through the water. At 0815 a new fix puts you 043°T, 1.4 nm from Westfield church spire.

   Plot the 0815 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