Worksheet 534 · Skill 5

Set and drift

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1. At 0715 your fix is 026°T, 2.7 nm from Gannet Rock daybeacon. You steer 167°T at 5.0 kn through the water. At 0745 a new fix puts you 103°T, 1.6 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0710 your fix is 031°T, 3.9 nm from Westfield church spire. You steer 142°T at 4.2 kn through the water. At 0800 a new fix puts you 061°T, 2.5 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1420 your fix is 090°T, 1.6 nm from Gannet Rock daybeacon. You steer 324°T at 5.1 kn through the water. At 1515 a new fix puts you 021°T, 2.1 nm from Tern Island tower.

   Plot the 1515 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  

4. At 0700 your fix is 111°T, 1.2 nm from Gannet Rock daybeacon. You steer 019°T at 5.0 kn through the water. At 0730 a new fix puts you 045°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 0730 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 1200 your fix is 310°T, 3.8 nm from Tern Island tower. You steer 159°T at 7.3 kn through the water. At 1255 a new fix puts you 056°T, 1.5 nm from Mill stack.

   Plot the 1255 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  

6. At 1055 your fix is 043°T, 3.8 nm from Westfield church spire. You steer 155°T at 5.1 kn through the water. At 1125 a new fix puts you 252°T, 3.3 nm from Tern Island tower.

   Plot the 1125 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 0820 your fix is 101°T, 1.1 nm from Westfield church spire. You steer 096°T at 4.7 kn through the water. At 0855 a new fix puts you 034°T, 3.1 nm from Heron Point Light.

   Plot the 0855 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 1405 your fix is 287°T, 3.9 nm from Tern Island tower. You steer 219°T at 5.1 kn through the water. At 1445 a new fix puts you 093°T, 2.3 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn