Worksheet 669 · Skill 5

Set and drift

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1. At 0925 your fix is 027°T, 1.7 nm from Mill stack. You steer 037°T at 4.2 kn through the water. At 1000 a new fix puts you 279°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1000 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 1310 your fix is 329°T, 2.4 nm from Tern Island tower. You steer 256°T at 6.6 kn through the water. At 1405 a new fix puts you 060°T, 2.8 nm from Westfield church spire.

   Plot the 1405 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  

3. At 1025 your fix is 008°T, 3.4 nm from Westfield church spire. You steer 123°T at 9.0 kn through the water. At 1105 a new fix puts you 235°T, 3.0 nm from Tern Island tower.

   Plot the 1105 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 0725 your fix is 167°T, 1.0 nm from Westfield church spire. You steer 125°T at 5.0 kn through the water. At 0800 a new fix puts you 023°T, 1.8 nm from Heron Point Light.

   Plot the 0800 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  

5. At 0920 your fix is 352°T, 3.2 nm from Mill stack. You steer 292°T at 4.2 kn through the water. At 1020 a new fix puts you 031°T, 3.2 nm from Heron Point Light.

   Plot the 1020 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  

6. At 1135 your fix is 022°T, 2.6 nm from Heron Point Light. You steer 350°T at 4.0 kn through the water. At 1230 a new fix puts you 297°T, 4.5 nm from Tern Island tower.

   Plot the 1230 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  

7. At 0955 your fix is 070°T, 2.0 nm from Westfield church spire. You steer 104°T at 5.3 kn through the water. At 1035 a new fix puts you 231°T, 2.6 nm from Tern Island tower.

   Plot the 1035 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  

8. At 1400 your fix is 088°T, 2.3 nm from Gannet Rock daybeacon. You steer 021°T at 4.4 kn through the water. At 1435 a new fix puts you 039°T, 4.2 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn