Worksheet 790 · Skill 5

Set and drift

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1. At 1435 your fix is 082°T, 1.9 nm from Heron Point Light. You steer 329°T at 6.3 kn through the water. At 1540 a new fix puts you 019°T, 3.0 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1325 your fix is 294°T, 3.6 nm from Tern Island tower. You steer 232°T at 5.8 kn through the water. At 1405 a new fix puts you 128°T, 0.9 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1255 your fix is 009°T, 2.4 nm from Westfield church spire. You steer 141°T at 5.9 kn through the water. At 1355 a new fix puts you 025°T, 2.0 nm from Heron Point Light.

   Plot the 1355 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 0705 your fix is 007°T, 1.9 nm from Gannet Rock daybeacon. You steer 029°T at 6.2 kn through the water. At 0740 a new fix puts you 062°T, 5.5 nm from Tern Island tower.

   Plot the 0740 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  

5. At 1215 your fix is 006°T, 1.8 nm from Mill stack. You steer 338°T at 8.4 kn through the water. At 1255 a new fix puts you 266°T, 2.4 nm from Tern Island tower.

   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  

6. At 0920 your fix is 140°T, 1.3 nm from Gannet Rock daybeacon. You steer 352°T at 4.0 kn through the water. At 1050 a new fix puts you 060°T, 3.7 nm from Tern Island tower.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0945 your fix is 023°T, 2.4 nm from Westfield church spire. You steer 120°T at 5.3 kn through the water. At 1040 a new fix puts you 259°T, 1.9 nm from Tern Island tower.

   Plot the 1040 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  

8. At 1230 your fix is 063°T, 3.8 nm from Westfield church spire. You steer 157°T at 6.9 kn through the water. At 1325 a new fix puts you 240°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1325 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