Worksheet 155 · Skill 5

Set and drift

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1. At 1250 your fix is 074°T, 2.1 nm from Westfield church spire. You steer 325°T at 4.1 kn through the water. At 1325 a new fix puts you 027°T, 3.3 nm from Westfield church spire.

   Plot the 1325 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  

2. At 1330 your fix is 346°T, 2.2 nm from Tern Island tower. You steer 229°T at 4.3 kn through the water. At 1410 a new fix puts you 298°T, 1.6 nm from Tern Island tower.

   Plot the 1410 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 0955 your fix is 255°T, 2.2 nm from Gannet Rock daybeacon. You steer 281°T at 7.9 kn through the water. At 1040 a new fix puts you 323°T, 1.8 nm from Heron Point Light.

   Plot the 1040 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 1320 your fix is 110°T, 2.5 nm from Westfield church spire. You steer 045°T at 7.2 kn through the water. At 1350 a new fix puts you 270°T, 1.8 nm from Tern Island tower.

   Plot the 1350 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  

5. At 0735 your fix is 080°T, 1.4 nm from Westfield church spire. You steer 083°T at 4.2 kn through the water. At 0830 a new fix puts you 219°T, 2.3 nm from Tern Island tower.

   Plot the 0830 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  

6. At 0700 your fix is 026°T, 0.8 nm from Gannet Rock daybeacon. You steer 004°T at 5.0 kn through the water. At 0735 a new fix puts you 045°T, 1.8 nm from Tern Island tower.

   Plot the 0735 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 0705 your fix is 229°T, 2.3 nm from Gannet Rock daybeacon. You steer 312°T at 4.1 kn through the water. At 0830 a new fix puts you 312°T, 3.3 nm from Tern Island tower.

   Plot the 0830 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  

8. At 1305 your fix is 074°T, 3.0 nm from Westfield church spire. You steer 192°T at 6.8 kn through the water. At 1335 a new fix puts you 022°T, 1.3 nm from Heron Point Light.

   Plot the 1335 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