Worksheet 334 · Skill 5

Set and drift

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1. At 1400 your fix is 054°T, 3.5 nm from Heron Point Light. You steer 323°T at 5.4 kn through the water. At 1440 a new fix puts you 069°T, 2.2 nm from Westfield church spire.

   Plot the 1440 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 0910 your fix is 090°T, 2.6 nm from Westfield church spire. You steer 122°T at 8.9 kn through the water. At 0950 a new fix puts you 057°T, 2.6 nm from Mill stack.

   Plot the 0950 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 0940 your fix is 271°T, 0.8 nm from Gannet Rock daybeacon. You steer 303°T at 5.6 kn through the water. At 1100 a new fix puts you 020°T, 3.6 nm from Westfield church spire.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1435 your fix is 347°T, 2.9 nm from Mill stack. You steer 358°T at 6.2 kn through the water. At 1530 a new fix puts you 302°T, 3.4 nm from Tern Island tower.

   Plot the 1530 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  

5. At 0940 your fix is 209°T, 1.2 nm from Gannet Rock daybeacon. You steer 086°T at 5.6 kn through the water. At 1020 a new fix puts you 104°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1020 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 1200 your fix is 272°T, 2.2 nm from Gannet Rock daybeacon. You steer 297°T at 7.0 kn through the water. At 1230 a new fix puts you 263°T, 3.3 nm from Tern Island tower.

   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  

7. At 0850 your fix is 036°T, 2.7 nm from Kittle water tank. You steer 329°T at 5.1 kn through the water. At 1005 a new fix puts you 056°T, 3.0 nm from Tern Island tower.

   Plot the 1005 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 1330 your fix is 038°T, 3.5 nm from Heron Point Light. You steer 236°T at 5.2 kn through the water. At 1400 a new fix puts you 005°T, 1.6 nm from Heron Point Light.

   Plot the 1400 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