Worksheet 835 · Skill 5

Set and drift

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1. At 1030 your fix is 353°T, 0.9 nm from Gannet Rock daybeacon. You steer 272°T at 6.1 kn through the water. At 1125 a new fix puts you 107°T, 1.6 nm from Westfield church spire.

   Plot the 1125 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 1455 your fix is 049°T, 3.3 nm from Gannet Rock daybeacon. You steer 261°T at 4.6 kn through the water. At 1540 a new fix puts you 106°T, 1.4 nm from Tern Island tower.

   Plot the 1540 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  

3. At 0945 your fix is 353°T, 2.4 nm from Mill stack. You steer 331°T at 6.1 kn through the water. At 1035 a new fix puts you 072°T, 3.4 nm from Westfield church spire.

   Plot the 1035 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 0800 your fix is 032°T, 3.8 nm from Westfield church spire. You steer 087°T at 5.7 kn through the water. At 0920 a new fix puts you 065°T, 3.0 nm from Tern Island tower.

   Plot the 0920 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  

5. At 1500 your fix is 239°T, 1.5 nm from Gannet Rock daybeacon. You steer 305°T at 6.5 kn through the water. At 1530 a new fix puts you 230°T, 2.3 nm from Tern Island tower.

   Plot the 1530 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  

6. At 1520 your fix is 047°T, 3.4 nm from Westfield church spire. You steer 089°T at 5.5 kn through the water. At 1600 a new fix puts you 308°T, 1.3 nm from Tern Island tower.

   Plot the 1600 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  

7. At 0940 your fix is 009°T, 2.6 nm from Westfield church spire. You steer 101°T at 4.7 kn through the water. At 1040 a new fix puts you 255°T, 1.7 nm from Tern Island tower.

   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  

8. At 0720 your fix is 082°T, 1.3 nm from Heron Point Light. You steer 089°T at 6.2 kn through the water. At 0750 a new fix puts you 247°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0750 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