Worksheet 741 · Skill 5

Set and drift

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1. At 1120 your fix is 010°T, 2.6 nm from Mill stack. You steer 321°T at 5.6 kn through the water. At 1245 a new fix puts you 046°T, 2.7 nm from Westfield church spire.

   Plot the 1245 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1420 your fix is 299°T, 1.8 nm from Tern Island tower. You steer 294°T at 7.2 kn through the water. At 1455 a new fix puts you 036°T, 3.9 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1125 your fix is 053°T, 4.1 nm from Westfield church spire. You steer 168°T at 6.1 kn through the water. At 1155 a new fix puts you 049°T, 3.3 nm from Heron Point Light.

   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  

4. At 1150 your fix is 346°T, 2.2 nm from Mill stack. You steer 043°T at 6.1 kn through the water. At 1225 a new fix puts you 212°T, 2.4 nm from Tern Island tower.

   Plot the 1225 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 0745 your fix is 022°T, 2.8 nm from Gannet Rock daybeacon. You steer 153°T at 4.1 kn through the water. At 0840 a new fix puts you 103°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 0840 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  

6. At 1030 your fix is 304°T, 2.2 nm from Tern Island tower. You steer 083°T at 6.9 kn through the water. At 1100 a new fix puts you 054°T, 1.7 nm from Tern Island tower.

   Plot the 1100 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 1135 your fix is 209°T, 3.2 nm from Tern Island tower. You steer 254°T at 7.9 kn through the water. At 1205 a new fix puts you 025°T, 1.3 nm from Heron Point Light.

   Plot the 1205 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 1305 your fix is 263°T, 3.1 nm from Tern Island tower. You steer 037°T at 4.1 kn through the water. At 1345 a new fix puts you 358°T, 1.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn