Worksheet 29 · Skill 5

Set and drift

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1. At 1130 your fix is 336°T, 2.2 nm from Mill stack. You steer 335°T at 6.4 kn through the water. At 1220 a new fix puts you 036°T, 3.5 nm from Westfield church spire.

   Plot the 1220 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  

2. At 0900 your fix is 021°T, 2.4 nm from Westfield church spire. You steer 100°T at 5.5 kn through the water. At 0945 a new fix puts you 283°T, 1.7 nm from Tern Island tower.

   Plot the 0945 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 1505 your fix is 024°T, 2.3 nm from Heron Point Light. You steer 026°T at 4.7 kn through the water. At 1605 a new fix puts you 341°T, 2.3 nm from Tern Island tower.

   Plot the 1605 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  

4. At 1410 your fix is 047°T, 4.1 nm from Westfield church spire. You steer 145°T at 5.6 kn through the water. At 1510 a new fix puts you 242°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1510 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  

5. At 0935 your fix is 276°T, 1.6 nm from Gannet Rock daybeacon. You steer 276°T at 4.9 kn through the water. At 1020 a new fix puts you 052°T, 3.5 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1450 your fix is 008°T, 1.6 nm from Mill stack. You steer 041°T at 6.8 kn through the water. At 1540 a new fix puts you 035°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1540 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 1005 your fix is 104°T, 2.7 nm from Westfield church spire. You steer 076°T at 6.5 kn through the water. At 1035 a new fix puts you 243°T, 2.6 nm from Tern Island tower.

   Plot the 1035 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 0845 your fix is 333°T, 2.4 nm from Mill stack. You steer 321°T at 4.0 kn through the water. At 0950 a new fix puts you 091°T, 3.0 nm from Westfield church spire.

   Plot the 0950 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