Worksheet 786 · Skill 5

Set and drift

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1. At 1510 your fix is 174°T, 1.7 nm from Gannet Rock daybeacon. You steer 028°T at 8.4 kn through the water. At 1545 a new fix puts you 071°T, 4.5 nm from Tern Island tower.

   Plot the 1545 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  

2. At 1125 your fix is 042°T, 4.3 nm from Westfield church spire. You steer 114°T at 6.4 kn through the water. At 1200 a new fix puts you 281°T, 2.4 nm from Tern Island tower.

   Plot the 1200 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  

3. At 0915 your fix is 011°T, 1.2 nm from Gannet Rock daybeacon. You steer 276°T at 7.9 kn through the water. At 0950 a new fix puts you 254°T, 3.0 nm from Tern Island tower.

   Plot the 0950 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  

4. At 0935 your fix is 063°T, 2.7 nm from Westfield church spire. You steer 170°T at 4.1 kn through the water. At 1015 a new fix puts you 102°T, 1.9 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0755 your fix is 050°T, 2.8 nm from Tern Island tower. You steer 257°T at 8.3 kn through the water. At 0845 a new fix puts you 049°T, 4.3 nm from Westfield church spire.

   Plot the 0845 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  

6. At 1305 your fix is 222°T, 2.7 nm from Tern Island tower. You steer 087°T at 5.1 kn through the water. At 1405 a new fix puts you 058°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1405 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  

7. At 1210 your fix is 205°T, 3.0 nm from Tern Island tower. You steer 201°T at 4.3 kn through the water. At 1240 a new fix puts you 351°T, 0.9 nm from Mill stack.

   Plot the 1240 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 1225 your fix is 074°T, 2.0 nm from Tern Island tower. You steer 158°T at 4.4 kn through the water. At 1345 a new fix puts you 101°T, 1.3 nm from Gannet Rock daybeacon.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn