Worksheet 607 · Skill 5

Set and drift

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1. At 1300 your fix is 061°T, 3.0 nm from Heron Point Light. You steer 330°T at 7.8 kn through the water. At 1345 a new fix puts you 034°T, 3.8 nm from Westfield church spire.

   Plot the 1345 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  

2. At 1450 your fix is 141°T, 2.3 nm from Tern Island tower. You steer 100°T at 4.3 kn through the water. At 1535 a new fix puts you 084°T, 3.2 nm from Gannet Rock daybeacon.

   Plot the 1535 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  

3. At 0755 your fix is 005°T, 2.6 nm from Westfield church spire. You steer 165°T at 5.0 kn through the water. At 0835 a new fix puts you 111°T, 2.0 nm from Westfield church spire.

   Plot the 0835 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 0835 your fix is 063°T, 1.8 nm from Kittle water tank. You steer 297°T at 5.0 kn through the water. At 0935 a new fix puts you 033°T, 2.4 nm from Mill stack.

   Plot the 0935 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  

5. At 0740 your fix is 063°T, 3.0 nm from Heron Point Light. You steer 023°T at 8.1 kn through the water. At 0815 a new fix puts you 334°T, 2.4 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1405 your fix is 054°T, 2.6 nm from Tern Island tower. You steer 147°T at 4.4 kn through the water. At 1435 a new fix puts you 053°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1435 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 0920 your fix is 069°T, 5.1 nm from Tern Island tower. You steer 213°T at 8.2 kn through the water. At 0955 a new fix puts you 087°T, 0.9 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1055 your fix is 023°T, 1.9 nm from Mill stack. You steer 291°T at 4.5 kn through the water. At 1210 a new fix puts you 129°T, 1.0 nm from Westfield church spire.

   Plot the 1210 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn