Worksheet 259 · Skill 5

Set and drift

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1. At 1315 your fix is 051°T, 4.1 nm from Westfield church spire. You steer 177°T at 5.5 kn through the water. At 1420 a new fix puts you 041°T, 0.9 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1125 your fix is 017°T, 1.0 nm from Kittle water tank. You steer 020°T at 6.7 kn through the water. At 1155 a new fix puts you 064°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1155 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  

3. At 1510 your fix is 083°T, 1.4 nm from Westfield church spire. You steer 350°T at 4.6 kn through the water. At 1540 a new fix puts you 038°T, 2.4 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1315 your fix is 335°T, 2.0 nm from Mill stack. You steer 047°T at 6.2 kn through the water. At 1350 a new fix puts you 295°T, 1.0 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1215 your fix is 042°T, 2.7 nm from Heron Point Light. You steer 103°T at 8.8 kn through the water. At 1305 a new fix puts you 180°T, 1.8 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1330 your fix is 046°T, 3.5 nm from Westfield church spire. You steer 131°T at 5.6 kn through the water. At 1405 a new fix puts you 242°T, 2.0 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0755 your fix is 028°T, 3.2 nm from Heron Point Light. You steer 336°T at 4.2 kn through the water. At 0845 a new fix puts you 028°T, 3.0 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  

8. At 1530 your fix is 111°T, 1.3 nm from Gannet Rock daybeacon. You steer 023°T at 6.3 kn through the water. At 1605 a new fix puts you 045°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1605 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