Worksheet 511 · Skill 5

Set and drift

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1. At 1430 your fix is 343°T, 1.5 nm from Gannet Rock daybeacon. You steer 236°T at 4.1 kn through the water. At 1545 a new fix puts you 055°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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0845 your fix is 054°T, 2.6 nm from Mill stack. You steer 282°T at 8.6 kn through the water. At 0920 a new fix puts you 357°T, 1.4 nm from Heron Point Light.

   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  

3. At 0955 your fix is 002°T, 1.3 nm from Gannet Rock daybeacon. You steer 048°T at 4.8 kn through the water. At 1040 a new fix puts you 058°T, 4.1 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1300 your fix is 040°T, 3.1 nm from Westfield church spire. You steer 068°T at 4.2 kn through the water. At 1330 a new fix puts you 308°T, 3.5 nm from Tern Island tower.

   Plot the 1330 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  

5. At 1310 your fix is 221°T, 1.0 nm from Gannet Rock daybeacon. You steer 315°T at 7.9 kn through the water. At 1405 a new fix puts you 061°T, 3.2 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0710 your fix is 293°T, 4.0 nm from Tern Island tower. You steer 165°T at 8.5 kn through the water. At 0755 a new fix puts you 013°T, 1.2 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1600 your fix is 332°T, 1.7 nm from Heron Point Light. You steer 079°T at 6.8 kn through the water. At 1730 a new fix puts you 026°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1730 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  

8. At 0740 your fix is 043°T, 3.2 nm from Heron Point Light. You steer 328°T at 7.5 kn through the water. At 0820 a new fix puts you 046°T, 3.3 nm from Westfield church spire.

   Plot the 0820 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