Worksheet 317 · Skill 5

Set and drift

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1. At 0900 your fix is 337°T, 1.5 nm from Tern Island tower. You steer 272°T at 5.2 kn through the water. At 0940 a new fix puts you 042°T, 4.1 nm from Westfield church spire.

   Plot the 0940 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  

2. At 1015 your fix is 237°T, 2.3 nm from Gannet Rock daybeacon. You steer 283°T at 4.4 kn through the water. At 1045 a new fix puts you 355°T, 2.6 nm from Mill stack.

   Plot the 1045 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 1430 your fix is 089°T, 2.2 nm from Westfield church spire. You steer 122°T at 6.0 kn through the water. At 1515 a new fix puts you 018°T, 2.3 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1105 your fix is 038°T, 3.1 nm from Westfield church spire. You steer 084°T at 6.1 kn through the water. At 1135 a new fix puts you 320°T, 3.1 nm from Tern Island tower.

   Plot the 1135 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 1100 your fix is 331°T, 1.3 nm from Tern Island tower. You steer 096°T at 5.3 kn through the water. At 1135 a new fix puts you 066°T, 3.5 nm from Tern Island tower.

   Plot the 1135 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 0840 your fix is 081°T, 2.9 nm from Tern Island tower. You steer 227°T at 4.2 kn through the water. At 0950 a new fix puts you 289°T, 1.0 nm from Gannet Rock daybeacon.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1010 your fix is 025°T, 2.6 nm from Tern Island tower. You steer 131°T at 6.5 kn through the water. At 1055 a new fix puts you 071°T, 2.9 nm from Gannet Rock daybeacon.

   Plot the 1055 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 0825 your fix is 077°T, 1.3 nm from Gannet Rock daybeacon. You steer 224°T at 4.1 kn through the water. At 0900 a new fix puts you 208°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 0900 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