Worksheet 799 · Skill 5

Set and drift

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1. At 0725 your fix is 241°T, 3.2 nm from Tern Island tower. You steer 172°T at 4.4 kn through the water. At 0800 a new fix puts you 348°T, 1.6 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1430 your fix is 033°T, 2.7 nm from Gannet Rock daybeacon. You steer 252°T at 5.5 kn through the water. At 1525 a new fix puts you 356°T, 2.5 nm from Mill stack.

   Plot the 1525 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  

3. At 0700 your fix is 056°T, 1.7 nm from Tern Island tower. You steer 137°T at 4.3 kn through the water. At 0800 a new fix puts you 029°T, 1.9 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0955 your fix is 031°T, 3.4 nm from Heron Point Light. You steer 110°T at 4.5 kn through the water. At 1125 a new fix puts you 070°T, 2.7 nm from Gannet Rock daybeacon.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1440 your fix is 077°T, 1.4 nm from Heron Point Light. You steer 121°T at 4.2 kn through the water. At 1515 a new fix puts you 337°T, 2.1 nm from Mill stack.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1245 your fix is 085°T, 2.7 nm from Tern Island tower. You steer 223°T at 5.5 kn through the water. At 1320 a new fix puts you 195°T, 2.0 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1335 your fix is 027°T, 3.3 nm from Heron Point Light. You steer 123°T at 4.9 kn through the water. At 1435 a new fix puts you 037°T, 1.3 nm from Mill stack.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0805 your fix is 050°T, 3.0 nm from Westfield church spire. You steer 145°T at 5.4 kn through the water. At 0840 a new fix puts you 224°T, 3.4 nm from Tern Island tower.

   Plot the 0840 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