Worksheet 125 · Skill 5

Set and drift

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1. At 1405 your fix is 030°T, 2.3 nm from Westfield church spire. You steer 148°T at 5.4 kn through the water. At 1500 a new fix puts you 347°T, 2.1 nm from Mill stack.

   Plot the 1500 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  

2. At 1050 your fix is 037°T, 3.9 nm from Westfield church spire. You steer 118°T at 6.1 kn through the water. At 1130 a new fix puts you 292°T, 1.9 nm from Tern Island tower.

   Plot the 1130 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 0755 your fix is 265°T, 2.1 nm from Gannet Rock daybeacon. You steer 054°T at 7.2 kn through the water. At 0840 a new fix puts you 072°T, 4.4 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1530 your fix is 060°T, 2.4 nm from Heron Point Light. You steer 303°T at 4.6 kn through the water. At 1610 a new fix puts you 099°T, 2.1 nm from Westfield church spire.

   Plot the 1610 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 1200 your fix is 300°T, 4.5 nm from Tern Island tower. You steer 178°T at 5.5 kn through the water. At 1300 a new fix puts you 354°T, 3.4 nm from Mill stack.

   Plot the 1300 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1040 your fix is 221°T, 3.3 nm from Tern Island tower. You steer 352°T at 7.4 kn through the water. At 1110 a new fix puts you 296°T, 1.9 nm from Tern Island tower.

   Plot the 1110 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 1525 your fix is 036°T, 3.0 nm from Heron Point Light. You steer 081°T at 5.7 kn through the water. At 1610 a new fix puts you 143°T, 2.5 nm from Tern Island tower.

   Plot the 1610 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  

8. At 0900 your fix is 131°T, 1.1 nm from Westfield church spire. You steer 051°T at 8.1 kn through the water. At 0940 a new fix puts you 299°T, 3.4 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn