Worksheet 768 · Skill 5

Set and drift

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1. At 1155 your fix is 009°T, 1.7 nm from Westfield church spire. You steer 114°T at 4.1 kn through the water. At 1305 a new fix puts you 256°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1305 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  

2. At 1415 your fix is 358°T, 2.2 nm from Westfield church spire. You steer 084°T at 6.7 kn through the water. At 1455 a new fix puts you 283°T, 1.9 nm from Tern Island tower.

   Plot the 1455 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 1340 your fix is 350°T, 1.8 nm from Heron Point Light. You steer 004°T at 4.3 kn through the water. At 1430 a new fix puts you 029°T, 3.0 nm from Westfield church spire.

   Plot the 1430 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1555 your fix is 243°T, 1.8 nm from Tern Island tower. You steer 145°T at 8.8 kn through the water. At 1625 a new fix puts you 311°T, 1.6 nm from Kittle water tank.

   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  

5. At 0855 your fix is 045°T, 3.4 nm from Gannet Rock daybeacon. You steer 247°T at 4.3 kn through the water. At 1005 a new fix puts you 206°T, 1.8 nm from Tern Island tower.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1015 your fix is 340°T, 2.5 nm from Tern Island tower. You steer 258°T at 5.4 kn through the water. At 1045 a new fix puts you 297°T, 4.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0805 your fix is 022°T, 2.1 nm from Westfield church spire. You steer 115°T at 5.3 kn through the water. At 0905 a new fix puts you 201°T, 2.1 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1055 your fix is 010°T, 2.6 nm from Westfield church spire. You steer 111°T at 5.8 kn through the water. At 1135 a new fix puts you 279°T, 3.9 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn