Worksheet 268 · Skill 5

Set and drift

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1. At 0850 your fix is 029°T, 1.9 nm from Heron Point Light. You steer 050°T at 5.3 kn through the water. At 0930 a new fix puts you 295°T, 1.4 nm from Tern Island tower.

   Plot the 0930 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 1520 your fix is 089°T, 1.7 nm from Heron Point Light. You steer 354°T at 4.8 kn through the water. At 1555 a new fix puts you 091°T, 3.3 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1345 your fix is 260°T, 3.4 nm from Tern Island tower. You steer 288°T at 4.4 kn through the water. At 1440 a new fix puts you 010°T, 1.0 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0730 your fix is 231°T, 1.4 nm from Tern Island tower. You steer 291°T at 7.7 kn through the water. At 0820 a new fix puts you 008°T, 3.0 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0815 your fix is 065°T, 4.5 nm from Tern Island tower. You steer 214°T at 5.5 kn through the water. At 0925 a new fix puts you 150°T, 2.6 nm from Tern Island tower.

   Plot the 0925 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  

6. At 0915 your fix is 053°T, 3.4 nm from Westfield church spire. You steer 072°T at 4.2 kn through the water. At 0955 a new fix puts you 285°T, 2.1 nm from Tern Island tower.

   Plot the 0955 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 1125 your fix is 358°T, 3.0 nm from Mill stack. You steer 057°T at 4.1 kn through the water. At 1235 a new fix puts you 319°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1235 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 0935 your fix is 266°T, 3.0 nm from Tern Island tower. You steer 060°T at 6.5 kn through the water. At 1025 a new fix puts you 046°T, 3.4 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn