Worksheet 736 · Skill 5

Set and drift

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1. At 0855 your fix is 158°T, 1.3 nm from Westfield church spire. You steer 074°T at 4.5 kn through the water. At 1010 a new fix puts you 222°T, 1.2 nm from Tern Island tower.

   Plot the 1010 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0800 your fix is 335°T, 1.8 nm from Heron Point Light. You steer 103°T at 5.2 kn through the water. At 0915 a new fix puts you 202°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0915 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1505 your fix is 248°T, 2.0 nm from Gannet Rock daybeacon. You steer 235°T at 4.9 kn through the water. At 1535 a new fix puts you 021°T, 2.0 nm from Mill stack.

   Plot the 1535 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 1145 your fix is 024°T, 2.1 nm from Heron Point Light. You steer 103°T at 8.7 kn through the water. At 1225 a new fix puts you 183°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1225 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  

5. At 1325 your fix is 291°T, 1.8 nm from Tern Island tower. You steer 064°T at 6.9 kn through the water. At 1400 a new fix puts you 021°T, 2.5 nm from Tern Island tower.

   Plot the 1400 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 1105 your fix is 339°T, 1.7 nm from Mill stack. You steer 318°T at 7.6 kn through the water. At 1135 a new fix puts you 083°T, 2.4 nm from Westfield church spire.

   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  

7. At 1245 your fix is 324°T, 3.0 nm from Tern Island tower. You steer 104°T at 7.9 kn through the water. At 1320 a new fix puts you 039°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  

8. At 0855 your fix is 304°T, 1.9 nm from Tern Island tower. You steer 261°T at 5.9 kn through the water. At 0940 a new fix puts you 023°T, 1.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn