Worksheet 726 · Skill 5

Set and drift

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1. At 0730 your fix is 283°T, 1.6 nm from Gannet Rock daybeacon. You steer 295°T at 9.0 kn through the water. At 0825 a new fix puts you 006°T, 3.3 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1045 your fix is 306°T, 3.8 nm from Tern Island tower. You steer 181°T at 4.1 kn through the water. At 1205 a new fix puts you 025°T, 1.7 nm from Mill stack.

   Plot the 1205 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  

3. At 1250 your fix is 290°T, 3.2 nm from Tern Island tower. You steer 194°T at 5.2 kn through the water. At 1345 a new fix puts you 047°T, 1.1 nm from Heron Point Light.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 044°T, 3.6 nm from Gannet Rock daybeacon. You steer 242°T at 4.0 kn through the water. At 1420 a new fix puts you 340°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1420 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  

5. At 0840 your fix is 261°T, 3.2 nm from Gannet Rock daybeacon. You steer 320°T at 8.7 kn through the water. At 0925 a new fix puts you 033°T, 2.8 nm from Westfield church spire.

   Plot the 0925 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  

6. At 1555 your fix is 226°T, 2.4 nm from Tern Island tower. You steer 158°T at 4.2 kn through the water. At 1640 a new fix puts you 026°T, 1.1 nm from Mill stack.

   Plot the 1640 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  

7. At 1400 your fix is 331°T, 1.7 nm from Tern Island tower. You steer 225°T at 4.4 kn through the water. At 1520 a new fix puts you 086°T, 3.2 nm from Westfield church spire.

   Plot the 1520 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 1210 your fix is 337°T, 2.5 nm from Tern Island tower. You steer 213°T at 7.8 kn through the water. At 1255 a new fix puts you 240°T, 3.2 nm from Tern Island tower.

   Plot the 1255 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