Worksheet 647 · Skill 5

Set and drift

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1. At 1005 your fix is 016°T, 2.6 nm from Tern Island tower. You steer 240°T at 6.2 kn through the water. At 1045 a new fix puts you 057°T, 3.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1300 your fix is 024°T, 3.8 nm from Westfield church spire. You steer 126°T at 5.2 kn through the water. At 1340 a new fix puts you 280°T, 3.5 nm from Tern Island tower.

   Plot the 1340 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  

3. At 1535 your fix is 046°T, 1.8 nm from Heron Point Light. You steer 067°T at 6.0 kn through the water. At 1635 a new fix puts you 168°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1635 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  

4. At 1040 your fix is 000°T, 1.6 nm from Heron Point Light. You steer 108°T at 6.0 kn through the water. At 1120 a new fix puts you 012°T, 1.8 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0940 your fix is 348°T, 2.6 nm from Mill stack. You steer 351°T at 5.8 kn through the water. At 1040 a new fix puts you 044°T, 4.0 nm from Westfield church spire.

   Plot the 1040 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  

6. At 0740 your fix is 092°T, 2.8 nm from Westfield church spire. You steer 325°T at 4.2 kn through the water. At 0815 a new fix puts you 038°T, 2.8 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1215 your fix is 247°T, 2.7 nm from Gannet Rock daybeacon. You steer 049°T at 5.3 kn through the water. At 1245 a new fix puts you 161°T, 1.1 nm from Tern Island tower.

   Plot the 1245 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 1325 your fix is 034°T, 2.0 nm from Westfield church spire. You steer 140°T at 4.5 kn through the water. At 1400 a new fix puts you 075°T, 2.2 nm from Westfield church spire.

   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