Worksheet 754 · Skill 5

Set and drift

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1. At 1320 your fix is 067°T, 3.6 nm from Westfield church spire. You steer 134°T at 6.8 kn through the water. At 1400 a new fix puts you 024°T, 2.7 nm from Mill stack.

   Plot the 1400 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 0745 your fix is 299°T, 3.6 nm from Tern Island tower. You steer 176°T at 6.2 kn through the water. At 0825 a new fix puts you 045°T, 3.0 nm from Heron Point Light.

   Plot the 0825 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  

3. At 0835 your fix is 034°T, 2.4 nm from Westfield church spire. You steer 106°T at 4.4 kn through the water. At 0905 a new fix puts you 265°T, 3.3 nm from Tern Island tower.

   Plot the 0905 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  

4. At 1415 your fix is 094°T, 2.3 nm from Gannet Rock daybeacon. You steer 194°T at 4.4 kn through the water. At 1445 a new fix puts you 355°T, 1.0 nm from Kittle water tank.

   Plot the 1445 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 1225 your fix is 011°T, 1.0 nm from Westfield church spire. You steer 088°T at 5.1 kn through the water. At 1315 a new fix puts you 251°T, 1.5 nm from Tern Island tower.

   Plot the 1315 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  

6. At 0925 your fix is 075°T, 2.6 nm from Heron Point Light. You steer 345°T at 5.7 kn through the water. At 1005 a new fix puts you 068°T, 2.5 nm from Westfield church spire.

   Plot the 1005 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 1525 your fix is 069°T, 4.6 nm from Tern Island tower. You steer 284°T at 4.5 kn through the water. At 1600 a new fix puts you 043°T, 2.2 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1415 your fix is 039°T, 0.9 nm from Heron Point Light. You steer 097°T at 6.3 kn through the water. At 1520 a new fix puts you 188°T, 1.5 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn