Worksheet 339 · Skill 5

Set and drift

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1. At 1210 your fix is 065°T, 2.9 nm from Westfield church spire. You steer 273°T at 4.8 kn through the water. At 1240 a new fix puts you 027°T, 1.6 nm from Westfield church spire.

   Plot the 1240 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  

2. At 1405 your fix is 221°T, 2.4 nm from Tern Island tower. You steer 252°T at 5.5 kn through the water. At 1435 a new fix puts you 038°T, 1.8 nm from Heron Point Light.

   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  

3. At 0700 your fix is 317°T, 2.5 nm from Tern Island tower. You steer 106°T at 7.8 kn through the water. At 0745 a new fix puts you 029°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 0745 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  

4. At 0825 your fix is 094°T, 1.2 nm from Westfield church spire. You steer 108°T at 4.1 kn through the water. At 0910 a new fix puts you 041°T, 2.9 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0705 your fix is 033°T, 3.5 nm from Westfield church spire. You steer 182°T at 5.1 kn through the water. At 0740 a new fix puts you 351°T, 2.1 nm from Heron Point Light.

   Plot the 0740 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 1240 your fix is 353°T, 2.2 nm from Tern Island tower. You steer 099°T at 5.4 kn through the water. At 1340 a new fix puts you 052°T, 3.8 nm from Tern Island tower.

   Plot the 1340 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  

7. At 0730 your fix is 264°T, 3.1 nm from Gannet Rock daybeacon. You steer 260°T at 7.2 kn through the water. At 0800 a new fix puts you 144°T, 3.5 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0735 your fix is 245°T, 2.1 nm from Tern Island tower. You steer 239°T at 5.3 kn through the water. At 0805 a new fix puts you 093°T, 3.6 nm from Westfield church spire.

   Plot the 0805 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