Worksheet 74 · Skill 5

Set and drift

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1. At 1145 your fix is 047°T, 3.2 nm from Westfield church spire. You steer 162°T at 7.5 kn through the water. At 1225 a new fix puts you 345°T, 2.3 nm from Mill stack.

   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  

2. At 0920 your fix is 098°T, 3.0 nm from Westfield church spire. You steer 105°T at 7.5 kn through the water. At 1015 a new fix puts you 274°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1015 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  

3. At 1600 your fix is 081°T, 2.7 nm from Tern Island tower. You steer 296°T at 5.2 kn through the water. At 1630 a new fix puts you 028°T, 1.7 nm from Tern Island tower.

   Plot the 1630 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 0925 your fix is 084°T, 1.6 nm from Gannet Rock daybeacon. You steer 335°T at 4.2 kn through the water. At 0955 a new fix puts you 028°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0955 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 1545 your fix is 038°T, 3.4 nm from Westfield church spire. You steer 120°T at 4.9 kn through the water. At 1640 a new fix puts you 257°T, 2.5 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1220 your fix is 003°T, 3.4 nm from Westfield church spire. You steer 125°T at 6.8 kn through the water. At 1350 a new fix puts you 203°T, 1.9 nm from Tern Island tower.

   Plot the 1350 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0935 your fix is 301°T, 2.7 nm from Tern Island tower. You steer 194°T at 4.4 kn through the water. At 1045 a new fix puts you 211°T, 2.2 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 204°T, 3.0 nm from Tern Island tower. You steer 064°T at 4.2 kn through the water. At 1510 a new fix puts you 022°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1510 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