Worksheet 863 · Skill 5

Set and drift

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1. At 1330 your fix is 307°T, 3.2 nm from Tern Island tower. You steer 174°T at 7.5 kn through the water. At 1405 a new fix puts you 353°T, 3.4 nm from Mill stack.

   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  

2. At 0900 your fix is 288°T, 2.9 nm from Tern Island tower. You steer 185°T at 5.2 kn through the water. At 0945 a new fix puts you 224°T, 3.3 nm from Tern Island tower.

   Plot the 0945 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 1345 your fix is 007°T, 2.5 nm from Tern Island tower. You steer 093°T at 4.8 kn through the water. At 1440 a new fix puts you 061°T, 4.7 nm from Tern Island tower.

   Plot the 1440 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  

4. At 1105 your fix is 093°T, 2.4 nm from Westfield church spire. You steer 121°T at 5.3 kn through the water. At 1225 a new fix puts you 025°T, 2.5 nm from Mill stack.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1540 your fix is 356°T, 1.7 nm from Mill stack. You steer 309°T at 5.6 kn through the water. At 1630 a new fix puts you 081°T, 2.7 nm from Westfield church spire.

   Plot the 1630 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 1200 your fix is 255°T, 3.4 nm from Tern Island tower. You steer 109°T at 4.3 kn through the water. At 1255 a new fix puts you 233°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1255 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  

7. At 1525 your fix is 080°T, 3.0 nm from Gannet Rock daybeacon. You steer 280°T at 6.1 kn through the water. At 1615 a new fix puts you 225°T, 1.8 nm from Tern Island tower.

   Plot the 1615 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 0715 your fix is 056°T, 2.9 nm from Westfield church spire. You steer 158°T at 6.1 kn through the water. At 0815 a new fix puts you 311°T, 2.1 nm from Mill stack.

   Plot the 0815 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