Worksheet 409 · Skill 5

Set and drift

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1. At 1505 your fix is 134°T, 1.9 nm from Westfield church spire. You steer 098°T at 5.8 kn through the water. At 1555 a new fix puts you 208°T, 2.9 nm from Tern Island tower.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1505 your fix is 332°T, 2.3 nm from Tern Island tower. You steer 271°T at 4.7 kn through the water. At 1600 a new fix puts you 039°T, 2.5 nm from Westfield church spire.

   Plot the 1600 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  

3. At 1245 your fix is 132°T, 3.3 nm from Tern Island tower. You steer 004°T at 4.0 kn through the water. At 1345 a new fix puts you 026°T, 2.5 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1255 your fix is 067°T, 3.7 nm from Tern Island tower. You steer 195°T at 5.1 kn through the water. At 1335 a new fix puts you 346°T, 3.2 nm from Kittle water tank.

   Plot the 1335 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 0755 your fix is 078°T, 1.8 nm from Tern Island tower. You steer 140°T at 5.5 kn through the water. At 0840 a new fix puts you 019°T, 1.1 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1215 your fix is 104°T, 1.8 nm from Gannet Rock daybeacon. You steer 350°T at 4.0 kn through the water. At 1245 a new fix puts you 035°T, 2.2 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1035 your fix is 026°T, 4.0 nm from Westfield church spire. You steer 203°T at 6.0 kn through the water. At 1105 a new fix puts you 053°T, 1.1 nm from Westfield church spire.

   Plot the 1105 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 0940 your fix is 052°T, 2.9 nm from Heron Point Light. You steer 305°T at 6.9 kn through the water. At 1020 a new fix puts you 060°T, 2.3 nm from Westfield church spire.

   Plot the 1020 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