Worksheet 832 · Skill 5

Set and drift

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1. At 0740 your fix is 019°T, 2.8 nm from Heron Point Light. You steer 142°T at 4.3 kn through the water. At 0815 a new fix puts you 059°T, 1.7 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0820 your fix is 067°T, 2.4 nm from Westfield church spire. You steer 067°T at 7.5 kn through the water. At 0910 a new fix puts you 039°T, 1.8 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0715 your fix is 296°T, 3.3 nm from Tern Island tower. You steer 075°T at 6.0 kn through the water. At 0755 a new fix puts you 035°T, 3.1 nm from Tern Island tower.

   Plot the 0755 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  

4. At 1550 your fix is 042°T, 2.3 nm from Heron Point Light. You steer 356°T at 4.7 kn through the water. At 1620 a new fix puts you 281°T, 3.9 nm from Tern Island tower.

   Plot the 1620 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 1320 your fix is 059°T, 2.7 nm from Gannet Rock daybeacon. You steer 287°T at 4.3 kn through the water. At 1355 a new fix puts you 102°T, 1.4 nm from Tern Island tower.

   Plot the 1355 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  

6. At 1420 your fix is 071°T, 1.9 nm from Heron Point Light. You steer 006°T at 6.3 kn through the water. At 1450 a new fix puts you 244°T, 3.4 nm from Tern Island tower.

   Plot the 1450 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 0850 your fix is 029°T, 2.5 nm from Westfield church spire. You steer 147°T at 4.5 kn through the water. At 0950 a new fix puts you 022°T, 3.1 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0745 your fix is 091°T, 3.7 nm from Westfield church spire. You steer 037°T at 6.6 kn through the water. At 0815 a new fix puts you 346°T, 1.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn