Worksheet 206 · Skill 5

Set and drift

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1. At 1200 your fix is 272°T, 3.5 nm from Tern Island tower. You steer 295°T at 4.9 kn through the water. At 1230 a new fix puts you 024°T, 2.6 nm from Westfield church spire.

   Plot the 1230 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 0845 your fix is 350°T, 1.8 nm from Mill stack. You steer 018°T at 4.2 kn through the water. At 0925 a new fix puts you 234°T, 2.6 nm from Tern Island tower.

   Plot the 0925 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 1400 your fix is 045°T, 1.8 nm from Heron Point Light. You steer 099°T at 5.8 kn through the water. At 1525 a new fix puts you 108°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1525 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  

4. At 1025 your fix is 052°T, 3.1 nm from Heron Point Light. You steer 006°T at 8.1 kn through the water. At 1100 a new fix puts you 289°T, 3.2 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  

5. At 1105 your fix is 039°T, 2.4 nm from Heron Point Light. You steer 087°T at 8.1 kn through the water. At 1140 a new fix puts you 292°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1140 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 1315 your fix is 020°T, 1.9 nm from Westfield church spire. You steer 140°T at 8.1 kn through the water. At 1405 a new fix puts you 048°T, 2.7 nm from Heron Point Light.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1235 your fix is 170°T, 1.6 nm from Tern Island tower. You steer 244°T at 4.1 kn through the water. At 1350 a new fix puts you 011°T, 1.9 nm from Heron Point Light.

   Plot the 1350 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1220 your fix is 203°T, 1.6 nm from Tern Island tower. You steer 177°T at 5.8 kn through the water. At 1300 a new fix puts you 062°T, 2.0 nm from Mill stack.

   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