Worksheet 143 · Skill 5

Set and drift

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1. At 1055 your fix is 047°T, 3.0 nm from Tern Island tower. You steer 179°T at 5.2 kn through the water. At 1135 a new fix puts you 057°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1135 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  

2. At 1225 your fix is 036°T, 2.1 nm from Mill stack. You steer 035°T at 7.6 kn through the water. At 1305 a new fix puts you 034°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1305 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  

3. At 1500 your fix is 045°T, 3.0 nm from Westfield church spire. You steer 184°T at 5.7 kn through the water. At 1545 a new fix puts you 020°T, 2.5 nm from Heron Point Light.

   Plot the 1545 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  

4. At 1215 your fix is 306°T, 1.4 nm from Gannet Rock daybeacon. You steer 063°T at 4.7 kn through the water. At 1255 a new fix puts you 039°T, 3.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1510 your fix is 149°T, 1.3 nm from Gannet Rock daybeacon. You steer 043°T at 6.9 kn through the water. At 1540 a new fix puts you 079°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1540 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  

6. At 0825 your fix is 164°T, 1.5 nm from Tern Island tower. You steer 285°T at 4.1 kn through the water. At 0950 a new fix puts you 062°T, 1.4 nm from Westfield church spire.

   Plot the 0950 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  

7. At 0720 your fix is 033°T, 2.8 nm from Gannet Rock daybeacon. You steer 228°T at 7.8 kn through the water. At 0755 a new fix puts you 179°T, 1.8 nm from Tern Island tower.

   Plot the 0755 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  

8. At 1435 your fix is 256°T, 2.1 nm from Gannet Rock daybeacon. You steer 303°T at 6.3 kn through the water. At 1535 a new fix puts you 123°T, 1.5 nm from Westfield church spire.

   Plot the 1535 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