Worksheet 711 · Skill 5

Set and drift

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1. At 1235 your fix is 063°T, 3.7 nm from Tern Island tower. You steer 261°T at 6.4 kn through the water. At 1400 a new fix puts you 019°T, 1.5 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1225 your fix is 039°T, 1.7 nm from Westfield church spire. You steer 139°T at 5.9 kn through the water. At 1340 a new fix puts you 022°T, 2.7 nm from Mill stack.

   Plot the 1340 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  

3. At 1120 your fix is 026°T, 3.5 nm from Westfield church spire. You steer 096°T at 4.2 kn through the water. At 1245 a new fix puts you 077°T, 2.8 nm from Tern Island tower.

   Plot the 1245 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 0830 your fix is 083°T, 3.5 nm from Westfield church spire. You steer 219°T at 4.5 kn through the water. At 0915 a new fix puts you 145°T, 3.4 nm from Westfield church spire.

   Plot the 0915 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  

5. At 1245 your fix is 354°T, 1.3 nm from Gannet Rock daybeacon. You steer 214°T at 5.5 kn through the water. At 1320 a new fix puts you 240°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1320 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 1120 your fix is 060°T, 3.9 nm from Westfield church spire. You steer 147°T at 7.8 kn through the water. At 1205 a new fix puts you 007°T, 2.5 nm from Mill stack.

   Plot the 1205 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 0910 your fix is 265°T, 2.1 nm from Tern Island tower. You steer 263°T at 8.7 kn through the water. At 0940 a new fix puts you 089°T, 1.2 nm from Westfield church spire.

   Plot the 0940 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 0915 your fix is 037°T, 2.2 nm from Heron Point Light. You steer 348°T at 6.3 kn through the water. At 0955 a new fix puts you 038°T, 4.0 nm from Westfield church spire.

   Plot the 0955 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