Worksheet 604 · Skill 5

Set and drift

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1. At 1245 your fix is 130°T, 1.9 nm from Westfield church spire. You steer 057°T at 5.8 kn through the water. At 1340 a new fix puts you 320°T, 1.1 nm from Tern Island tower.

   Plot the 1340 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 1215 your fix is 069°T, 2.9 nm from Westfield church spire. You steer 124°T at 7.5 kn through the water. At 1250 a new fix puts you 274°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1250 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 1020 your fix is 075°T, 1.3 nm from Westfield church spire. You steer 116°T at 5.3 kn through the water. At 1125 a new fix puts you 236°T, 2.5 nm from Gannet Rock daybeacon.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1515 your fix is 288°T, 3.8 nm from Tern Island tower. You steer 225°T at 7.2 kn through the water. At 1555 a new fix puts you 162°T, 1.5 nm from Westfield church spire.

   Plot the 1555 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 1115 your fix is 072°T, 3.9 nm from Tern Island tower. You steer 284°T at 5.6 kn through the water. At 1155 a new fix puts you 329°T, 2.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0715 your fix is 046°T, 4.1 nm from Westfield church spire. You steer 090°T at 8.1 kn through the water. At 0805 a new fix puts you 028°T, 2.1 nm from Tern Island tower.

   Plot the 0805 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  

7. At 1530 your fix is 217°T, 1.7 nm from Gannet Rock daybeacon. You steer 327°T at 4.3 kn through the water. At 1620 a new fix puts you 234°T, 2.7 nm from Tern Island tower.

   Plot the 1620 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 0845 your fix is 155°T, 2.7 nm from Tern Island tower. You steer 026°T at 4.4 kn through the water. At 0950 a new fix puts you 069°T, 5.1 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn