Worksheet 761 · Skill 5

Set and drift

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1. At 1550 your fix is 355°T, 3.2 nm from Mill stack. You steer 320°T at 4.3 kn through the water. At 1705 a new fix puts you 015°T, 3.8 nm from Westfield church spire.

   Plot the 1705 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  

2. At 0730 your fix is 094°T, 2.0 nm from Tern Island tower. You steer 065°T at 4.8 kn through the water. At 0800 a new fix puts you 072°T, 4.7 nm from Tern Island tower.

   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  

3. At 1130 your fix is 007°T, 2.4 nm from Heron Point Light. You steer 072°T at 4.5 kn through the water. At 1210 a new fix puts you 240°T, 1.5 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1330 your fix is 128°T, 1.1 nm from Westfield church spire. You steer 102°T at 7.4 kn through the water. At 1425 a new fix puts you 160°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1425 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  

5. At 0900 your fix is 243°T, 1.2 nm from Gannet Rock daybeacon. You steer 271°T at 4.8 kn through the water. At 0935 a new fix puts you 218°T, 3.2 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0950 your fix is 093°T, 2.0 nm from Westfield church spire. You steer 032°T at 5.4 kn through the water. At 1020 a new fix puts you 285°T, 3.6 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0925 your fix is 293°T, 1.3 nm from Tern Island tower. You steer 218°T at 5.6 kn through the water. At 1010 a new fix puts you 027°T, 1.8 nm from Heron Point Light.

   Plot the 1010 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  

8. At 1245 your fix is 076°T, 3.2 nm from Westfield church spire. You steer 207°T at 5.4 kn through the water. At 1315 a new fix puts you 158°T, 1.7 nm from Westfield church spire.

   Plot the 1315 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