Worksheet 233 · Skill 5

Set and drift

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1. At 0920 your fix is 209°T, 2.2 nm from Gannet Rock daybeacon. You steer 081°T at 5.7 kn through the water. At 1000 a new fix puts you 101°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1000 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 0850 your fix is 238°T, 3.2 nm from Tern Island tower. You steer 015°T at 6.2 kn through the water. At 0920 a new fix puts you 290°T, 1.7 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1045 your fix is 282°T, 3.6 nm from Tern Island tower. You steer 305°T at 4.4 kn through the water. At 1120 a new fix puts you 011°T, 3.7 nm from Westfield church spire.

   Plot the 1120 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  

4. At 0830 your fix is 023°T, 3.4 nm from Westfield church spire. You steer 151°T at 5.1 kn through the water. At 0905 a new fix puts you 266°T, 3.1 nm from Tern Island tower.

   Plot the 0905 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 1425 your fix is 248°T, 3.1 nm from Tern Island tower. You steer 088°T at 7.0 kn through the water. At 1510 a new fix puts you 012°T, 1.2 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1055 your fix is 053°T, 2.7 nm from Heron Point Light. You steer 334°T at 8.7 kn through the water. At 1125 a new fix puts you 040°T, 3.4 nm from Westfield church spire.

   Plot the 1125 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 1555 your fix is 234°T, 1.8 nm from Gannet Rock daybeacon. You steer 099°T at 7.7 kn through the water. At 1625 a new fix puts you 104°T, 2.5 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1330 your fix is 060°T, 3.2 nm from Heron Point Light. You steer 286°T at 4.6 kn through the water. At 1405 a new fix puts you 001°T, 1.5 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn