Worksheet 496 · Skill 5

Set and drift

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1. At 1205 your fix is 041°T, 4.5 nm from Westfield church spire. You steer 100°T at 5.3 kn through the water. At 1310 a new fix puts you 071°T, 2.4 nm from Tern Island tower.

   Plot the 1310 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  

2. At 1250 your fix is 080°T, 3.0 nm from Westfield church spire. You steer 090°T at 4.6 kn through the water. At 1330 a new fix puts you 195°T, 1.2 nm from Tern Island tower.

   Plot the 1330 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 1345 your fix is 146°T, 1.7 nm from Westfield church spire. You steer 117°T at 6.7 kn through the water. At 1420 a new fix puts you 085°T, 2.1 nm from Heron Point Light.

   Plot the 1420 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  

4. At 0710 your fix is 001°T, 1.6 nm from Heron Point Light. You steer 023°T at 5.7 kn through the water. At 0755 a new fix puts you 279°T, 3.5 nm from Tern Island tower.

   Plot the 0755 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  

5. At 1545 your fix is 019°T, 2.6 nm from Tern Island tower. You steer 234°T at 6.3 kn through the water. At 1655 a new fix puts you 069°T, 1.9 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1140 your fix is 071°T, 3.4 nm from Westfield church spire. You steer 067°T at 5.8 kn through the water. At 1210 a new fix puts you 347°T, 1.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1305 your fix is 261°T, 2.5 nm from Gannet Rock daybeacon. You steer 269°T at 4.7 kn through the water. At 1415 a new fix puts you 024°T, 1.6 nm from Heron Point Light.

   Plot the 1415 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  

8. At 1335 your fix is 048°T, 1.4 nm from Heron Point Light. You steer 329°T at 4.0 kn through the water. At 1435 a new fix puts you 036°T, 2.6 nm from Westfield church spire.

   Plot the 1435 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