Worksheet 491 · Skill 5

Set and drift

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1. At 0745 your fix is 013°T, 1.0 nm from Kittle water tank. You steer 293°T at 5.8 kn through the water. At 0840 a new fix puts you 037°T, 2.9 nm from Heron Point Light.

   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  

2. At 1045 your fix is 011°T, 2.9 nm from Mill stack. You steer 101°T at 6.5 kn through the water. At 1120 a new fix puts you 194°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1120 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 0940 your fix is 349°T, 1.9 nm from Tern Island tower. You steer 242°T at 5.7 kn through the water. At 1015 a new fix puts you 076°T, 3.7 nm from Westfield church spire.

   Plot the 1015 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  

4. At 1320 your fix is 091°T, 1.7 nm from Gannet Rock daybeacon. You steer 006°T at 5.2 kn through the water. At 1415 a new fix puts you 056°T, 4.4 nm from Tern Island tower.

   Plot the 1415 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  

5. At 1045 your fix is 051°T, 2.7 nm from Heron Point Light. You steer 016°T at 7.5 kn through the water. At 1120 a new fix puts you 298°T, 2.7 nm from Tern Island tower.

   Plot the 1120 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  

6. At 0820 your fix is 276°T, 1.0 nm from Gannet Rock daybeacon. You steer 221°T at 5.8 kn through the water. At 0855 a new fix puts you 343°T, 2.2 nm from Mill stack.

   Plot the 0855 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 1120 your fix is 051°T, 1.4 nm from Westfield church spire. You steer 111°T at 6.4 kn through the water. At 1200 a new fix puts you 038°T, 3.2 nm from Heron Point Light.

   Plot the 1200 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  

8. At 1425 your fix is 046°T, 3.3 nm from Westfield church spire. You steer 106°T at 5.0 kn through the water. At 1510 a new fix puts you 287°T, 2.4 nm from Tern Island tower.

   Plot the 1510 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