Worksheet 72 · Skill 5

Set and drift

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1. At 0810 your fix is 259°T, 2.9 nm from Tern Island tower. You steer 331°T at 7.1 kn through the water. At 0840 a new fix puts you 031°T, 3.4 nm from Westfield church spire.

   Plot the 0840 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 114°T, 1.8 nm from Westfield church spire. You steer 060°T at 4.0 kn through the water. At 1000 a new fix puts you 078°T, 3.2 nm from Westfield church spire.

   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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1315 your fix is 352°T, 1.5 nm from Heron Point Light. You steer 039°T at 6.5 kn through the water. At 1400 a new fix puts you 300°T, 1.7 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1025 your fix is 046°T, 2.2 nm from Heron Point Light. You steer 108°T at 6.1 kn through the water. At 1105 a new fix puts you 016°T, 2.2 nm from Mill stack.

   Plot the 1105 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  

5. At 1050 your fix is 180°T, 1.6 nm from Gannet Rock daybeacon. You steer 257°T at 8.3 kn through the water. At 1125 a new fix puts you 102°T, 1.7 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1410 your fix is 080°T, 2.6 nm from Westfield church spire. You steer 066°T at 8.3 kn through the water. At 1445 a new fix puts you 016°T, 1.6 nm from Tern Island tower.

   Plot the 1445 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  

7. At 0840 your fix is 268°T, 2.6 nm from Tern Island tower. You steer 314°T at 4.4 kn through the water. At 0910 a new fix puts you 042°T, 3.7 nm from Westfield church spire.

   Plot the 0910 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 0945 your fix is 068°T, 3.4 nm from Westfield church spire. You steer 165°T at 6.0 kn through the water. At 1020 a new fix puts you 044°T, 2.5 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn