Worksheet 22 · Skill 5

Set and drift

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1. At 1540 your fix is 094°T, 2.4 nm from Westfield church spire. You steer 113°T at 5.7 kn through the water. At 1620 a new fix puts you 218°T, 2.1 nm from Tern Island tower.

   Plot the 1620 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 0750 your fix is 076°T, 2.1 nm from Heron Point Light. You steer 359°T at 4.7 kn through the water. At 0845 a new fix puts you 032°T, 3.5 nm from Heron Point Light.

   Plot the 0845 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  

3. At 0910 your fix is 088°T, 1.7 nm from Tern Island tower. You steer 201°T at 4.2 kn through the water. At 1010 a new fix puts you 040°T, 2.6 nm from Mill stack.

   Plot the 1010 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  

4. At 0750 your fix is 315°T, 2.7 nm from Tern Island tower. You steer 206°T at 4.2 kn through the water. At 0825 a new fix puts you 252°T, 2.3 nm from Tern Island tower.

   Plot the 0825 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  

5. At 1235 your fix is 052°T, 1.9 nm from Gannet Rock daybeacon. You steer 261°T at 7.0 kn through the water. At 1340 a new fix puts you 232°T, 2.4 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1015 your fix is 043°T, 3.1 nm from Westfield church spire. You steer 174°T at 6.0 kn through the water. At 1050 a new fix puts you 046°T, 1.2 nm from Heron Point Light.

   Plot the 1050 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 1250 your fix is 190°T, 1.8 nm from Gannet Rock daybeacon. You steer 309°T at 7.0 kn through the water. At 1355 a new fix puts you 062°T, 2.3 nm from Westfield church spire.

   Plot the 1355 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0825 your fix is 079°T, 2.8 nm from Gannet Rock daybeacon. You steer 269°T at 5.5 kn through the water. At 0940 a new fix puts you 202°T, 1.9 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn