Worksheet 782 · Skill 5

Set and drift

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1. At 0920 your fix is 014°T, 1.9 nm from Tern Island tower. You steer 146°T at 8.6 kn through the water. At 1000 a new fix puts you 006°T, 1.9 nm from Kittle water tank.

   Plot the 1000 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 0820 your fix is 282°T, 2.7 nm from Tern Island tower. You steer 212°T at 4.1 kn through the water. At 0850 a new fix puts you 103°T, 2.8 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  

3. At 1420 your fix is 216°T, 3.2 nm from Tern Island tower. You steer 227°T at 6.3 kn through the water. At 1450 a new fix puts you 313°T, 2.0 nm from Mill stack.

   Plot the 1450 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 0730 your fix is 038°T, 1.2 nm from Westfield church spire. You steer 071°T at 5.8 kn through the water. At 0820 a new fix puts you 299°T, 3.0 nm from Tern Island tower.

   Plot the 0820 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 1130 your fix is 058°T, 1.4 nm from Westfield church spire. You steer 144°T at 4.9 kn through the water. At 1210 a new fix puts you 062°T, 2.7 nm from Heron Point Light.

   Plot the 1210 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  

6. At 0715 your fix is 253°T, 3.3 nm from Tern Island tower. You steer 128°T at 4.9 kn through the water. At 0815 a new fix puts you 248°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 0815 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  

7. At 1405 your fix is 350°T, 1.3 nm from Gannet Rock daybeacon. You steer 027°T at 6.3 kn through the water. At 1435 a new fix puts you 058°T, 3.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1015 your fix is 020°T, 1.9 nm from Mill stack. You steer 046°T at 5.2 kn through the water. At 1055 a new fix puts you 008°T, 1.0 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn