Worksheet 250 · Skill 5

Set and drift

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1. At 1600 your fix is 029°T, 2.2 nm from Tern Island tower. You steer 163°T at 6.1 kn through the water. At 1655 a new fix puts you 131°T, 2.8 nm from Tern Island tower.

   Plot the 1655 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 1145 your fix is 270°T, 1.9 nm from Tern Island tower. You steer 027°T at 4.8 kn through the water. At 1220 a new fix puts you 332°T, 2.8 nm from Tern Island tower.

   Plot the 1220 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  

3. At 0835 your fix is 046°T, 3.2 nm from Heron Point Light. You steer 297°T at 6.1 kn through the water. At 0905 a new fix puts you 054°T, 0.9 nm from Westfield church spire.

   Plot the 0905 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  

4. At 1100 your fix is 051°T, 3.4 nm from Tern Island tower. You steer 201°T at 4.0 kn through the water. At 1210 a new fix puts you 346°T, 0.8 nm from Gannet Rock daybeacon.

   Plot the 1210 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1140 your fix is 253°T, 1.0 nm from Gannet Rock daybeacon. You steer 281°T at 7.2 kn through the water. At 1240 a new fix puts you 177°T, 1.4 nm from Westfield church spire.

   Plot the 1240 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 1440 your fix is 023°T, 1.2 nm from Gannet Rock daybeacon. You steer 228°T at 5.2 kn through the water. At 1520 a new fix puts you 258°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1520 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  

7. At 1520 your fix is 086°T, 3.4 nm from Westfield church spire. You steer 214°T at 5.1 kn through the water. At 1600 a new fix puts you 341°T, 1.7 nm from Heron Point Light.

   Plot the 1600 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  

8. At 0705 your fix is 307°T, 1.4 nm from Tern Island tower. You steer 271°T at 4.0 kn through the water. At 0805 a new fix puts you 039°T, 3.5 nm from Westfield church spire.

   Plot the 0805 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