Worksheet 225 · Skill 5

Set and drift

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1. At 0820 your fix is 046°T, 1.6 nm from Gannet Rock daybeacon. You steer 009°T at 4.8 kn through the water. At 0855 a new fix puts you 036°T, 4.7 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1040 your fix is 223°T, 2.0 nm from Tern Island tower. You steer 306°T at 6.3 kn through the water. At 1115 a new fix puts you 289°T, 3.6 nm from Tern Island tower.

   Plot the 1115 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  

3. At 1035 your fix is 265°T, 3.6 nm from Tern Island tower. You steer 132°T at 4.8 kn through the water. At 1120 a new fix puts you 232°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1120 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 0915 your fix is 009°T, 2.1 nm from Westfield church spire. You steer 143°T at 5.1 kn through the water. At 1005 a new fix puts you 091°T, 3.0 nm from Westfield church spire.

   Plot the 1005 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  

5. At 1400 your fix is 058°T, 3.6 nm from Westfield church spire. You steer 121°T at 4.7 kn through the water. At 1510 a new fix puts you 214°T, 2.1 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1435 your fix is 017°T, 2.2 nm from Westfield church spire. You steer 112°T at 7.9 kn through the water. At 1515 a new fix puts you 250°T, 2.1 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1225 your fix is 065°T, 3.2 nm from Westfield church spire. You steer 063°T at 4.9 kn through the water. At 1255 a new fix puts you 283°T, 1.5 nm from Tern Island tower.

   Plot the 1255 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 1010 your fix is 253°T, 3.5 nm from Tern Island tower. You steer 180°T at 4.6 kn through the water. At 1055 a new fix puts you 322°T, 1.5 nm from Mill stack.

   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