Worksheet 157 · Skill 5

Set and drift

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1. At 0845 your fix is 022°T, 1.8 nm from Tern Island tower. You steer 259°T at 8.7 kn through the water. At 0920 a new fix puts you 044°T, 2.6 nm from Westfield church spire.

   Plot the 0920 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  

2. At 0935 your fix is 021°T, 3.0 nm from Heron Point Light. You steer 259°T at 4.0 kn through the water. At 1010 a new fix puts you 142°T, 1.6 nm from Westfield church spire.

   Plot the 1010 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 1310 your fix is 108°T, 2.2 nm from Gannet Rock daybeacon. You steer 009°T at 5.4 kn through the water. At 1405 a new fix puts you 065°T, 4.7 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1505 your fix is 208°T, 2.8 nm from Tern Island tower. You steer 310°T at 5.0 kn through the water. At 1625 a new fix puts you 068°T, 3.6 nm from Westfield church spire.

   Plot the 1625 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1220 your fix is 022°T, 2.1 nm from Tern Island tower. You steer 265°T at 4.4 kn through the water. At 1300 a new fix puts you 296°T, 1.5 nm from Tern Island tower.

   Plot the 1300 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 1350 your fix is 021°T, 2.6 nm from Gannet Rock daybeacon. You steer 224°T at 4.5 kn through the water. At 1450 a new fix puts you 045°T, 2.3 nm from Mill stack.

   Plot the 1450 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  

7. At 1440 your fix is 020°T, 2.8 nm from Heron Point Light. You steer 158°T at 4.4 kn through the water. At 1510 a new fix puts you 062°T, 1.7 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 352°T, 3.3 nm from Mill stack. You steer 096°T at 7.1 kn through the water. At 1420 a new fix puts you 258°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1420 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