Worksheet 866 · Skill 5

Set and drift

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1. At 0750 your fix is 008°T, 0.9 nm from Gannet Rock daybeacon. You steer 108°T at 4.5 kn through the water. At 0825 a new fix puts you 068°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0825 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 0910 your fix is 036°T, 4.1 nm from Westfield church spire. You steer 175°T at 5.6 kn through the water. At 0945 a new fix puts you 067°T, 2.5 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1550 your fix is 134°T, 3.0 nm from Tern Island tower. You steer 272°T at 5.5 kn through the water. At 1715 a new fix puts you 011°T, 2.0 nm from Westfield church spire.

   Plot the 1715 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0940 your fix is 358°T, 1.5 nm from Heron Point Light. You steer 007°T at 4.5 kn through the water. At 1045 a new fix puts you 293°T, 3.7 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1535 your fix is 281°T, 3.1 nm from Tern Island tower. You steer 288°T at 5.0 kn through the water. At 1610 a new fix puts you 030°T, 4.0 nm from Westfield church spire.

   Plot the 1610 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 0955 your fix is 217°T, 2.9 nm from Tern Island tower. You steer 137°T at 5.4 kn through the water. At 1030 a new fix puts you 038°T, 2.0 nm from Mill stack.

   Plot the 1030 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 1415 your fix is 346°T, 2.1 nm from Tern Island tower. You steer 253°T at 8.3 kn through the water. At 1450 a new fix puts you 060°T, 2.7 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0900 your fix is 064°T, 2.7 nm from Tern Island tower. You steer 152°T at 6.6 kn through the water. At 0940 a new fix puts you 064°T, 2.7 nm from Gannet Rock daybeacon.

   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