Worksheet 735 · Skill 5

Set and drift

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1. At 1300 your fix is 037°T, 2.8 nm from Westfield church spire. You steer 183°T at 4.1 kn through the water. At 1405 a new fix puts you 077°T, 1.8 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1530 your fix is 326°T, 1.8 nm from Tern Island tower. You steer 264°T at 5.2 kn through the water. At 1615 a new fix puts you 040°T, 3.1 nm from Westfield church spire.

   Plot the 1615 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  

3. At 1245 your fix is 068°T, 2.8 nm from Westfield church spire. You steer 067°T at 7.2 kn through the water. At 1315 a new fix puts you 294°T, 1.7 nm from Tern Island tower.

   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  

4. At 1240 your fix is 306°T, 0.9 nm from Gannet Rock daybeacon. You steer 233°T at 5.8 kn through the water. At 1320 a new fix puts you 345°T, 1.6 nm from Mill stack.

   Plot the 1320 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  

5. At 0810 your fix is 092°T, 2.0 nm from Heron Point Light. You steer 018°T at 5.5 kn through the water. At 0855 a new fix puts you 284°T, 3.1 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0735 your fix is 034°T, 4.2 nm from Gannet Rock daybeacon. You steer 237°T at 5.2 kn through the water. At 0825 a new fix puts you 134°T, 3.1 nm from Tern Island tower.

   Plot the 0825 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  

7. At 0945 your fix is 033°T, 4.2 nm from Westfield church spire. You steer 172°T at 4.0 kn through the water. At 1050 a new fix puts you 027°T, 1.8 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0820 your fix is 215°T, 3.2 nm from Tern Island tower. You steer 302°T at 5.4 kn through the water. At 0850 a new fix puts you 084°T, 3.1 nm from Westfield church spire.

   Plot the 0850 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