Worksheet 207 · Skill 5

Set and drift

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1. At 1315 your fix is 083°T, 2.1 nm from Gannet Rock daybeacon. You steer 301°T at 5.4 kn through the water. At 1345 a new fix puts you 140°T, 2.6 nm from Tern Island tower.

   Plot the 1345 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  

2. At 1555 your fix is 350°T, 1.0 nm from Gannet Rock daybeacon. You steer 102°T at 4.7 kn through the water. At 1625 a new fix puts you 069°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1625 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 0835 your fix is 313°T, 2.1 nm from Tern Island tower. You steer 071°T at 6.0 kn through the water. At 0905 a new fix puts you 038°T, 2.7 nm from Tern Island tower.

   Plot the 0905 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 0830 your fix is 095°T, 2.8 nm from Gannet Rock daybeacon. You steer 336°T at 7.4 kn through the water. At 0910 a new fix puts you 049°T, 3.4 nm from Tern Island tower.

   Plot the 0910 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 0805 your fix is 051°T, 3.8 nm from Gannet Rock daybeacon. You steer 243°T at 5.8 kn through the water. At 0910 a new fix puts you 350°T, 3.1 nm from Mill stack.

   Plot the 0910 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  

6. At 0705 your fix is 142°T, 1.7 nm from Westfield church spire. You steer 031°T at 5.1 kn through the water. At 0740 a new fix puts you 041°T, 2.0 nm from Westfield church spire.

   Plot the 0740 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 0845 your fix is 164°T, 1.2 nm from Westfield church spire. You steer 100°T at 7.3 kn through the water. At 1005 a new fix puts you 113°T, 1.6 nm from Gannet Rock daybeacon.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1230 your fix is 194°T, 1.6 nm from Tern Island tower. You steer 258°T at 8.8 kn through the water. At 1300 a new fix puts you 044°T, 2.6 nm from Heron Point Light.

   Plot the 1300 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