Worksheet 441 · Skill 5

Set and drift

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1. At 1025 your fix is 027°T, 3.1 nm from Westfield church spire. You steer 116°T at 4.9 kn through the water. At 1110 a new fix puts you 249°T, 2.0 nm from Tern Island tower.

   Plot the 1110 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 1345 your fix is 064°T, 2.9 nm from Westfield church spire. You steer 125°T at 8.3 kn through the water. At 1415 a new fix puts you 278°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1415 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  

3. At 1105 your fix is 037°T, 3.8 nm from Westfield church spire. You steer 149°T at 5.2 kn through the water. At 1215 a new fix puts you 227°T, 2.9 nm from Tern Island tower.

   Plot the 1215 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  

4. At 0940 your fix is 028°T, 2.5 nm from Mill stack. You steer 295°T at 5.3 kn through the water. At 1015 a new fix puts you 072°T, 2.4 nm from Heron Point Light.

   Plot the 1015 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 023°T, 3.1 nm from Westfield church spire. You steer 139°T at 4.8 kn through the water. At 1005 a new fix puts you 090°T, 2.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0930 your fix is 009°T, 2.3 nm from Westfield church spire. You steer 168°T at 4.3 kn through the water. At 1025 a new fix puts you 120°T, 2.1 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1120 your fix is 073°T, 3.3 nm from Westfield church spire. You steer 124°T at 5.5 kn through the water. At 1245 a new fix puts you 208°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1245 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1020 your fix is 343°T, 1.4 nm from Gannet Rock daybeacon. You steer 088°T at 4.9 kn through the water. At 1050 a new fix puts you 045°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1050 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