Worksheet 892 · Skill 5

Set and drift

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1. At 1450 your fix is 261°T, 2.6 nm from Gannet Rock daybeacon. You steer 049°T at 4.0 kn through the water. At 1520 a new fix puts you 163°T, 1.1 nm from Tern Island tower.

   Plot the 1520 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  

2. At 1035 your fix is 020°T, 1.6 nm from Mill stack. You steer 308°T at 8.0 kn through the water. At 1120 a new fix puts you 050°T, 2.6 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1025 your fix is 194°T, 0.9 nm from Gannet Rock daybeacon. You steer 313°T at 5.3 kn through the water. At 1100 a new fix puts you 192°T, 2.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1035 your fix is 082°T, 3.5 nm from Westfield church spire. You steer 107°T at 5.7 kn through the water. At 1120 a new fix puts you 179°T, 1.2 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1025 your fix is 268°T, 2.6 nm from Tern Island tower. You steer 281°T at 7.8 kn through the water. At 1100 a new fix puts you 357°T, 1.5 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1145 your fix is 048°T, 3.3 nm from Heron Point Light. You steer 150°T at 5.4 kn through the water. At 1215 a new fix puts you 021°T, 1.7 nm from Mill stack.

   Plot the 1215 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 1005 your fix is 009°T, 1.4 nm from Westfield church spire. You steer 128°T at 4.1 kn through the water. At 1050 a new fix puts you 083°T, 1.8 nm from Westfield church spire.

   Plot the 1050 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  

8. At 0755 your fix is 352°T, 3.3 nm from Mill stack. You steer 075°T at 5.0 kn through the water. At 0855 a new fix puts you 056°T, 3.3 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn