Worksheet 856 · Skill 5

Set and drift

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1. At 1245 your fix is 146°T, 1.3 nm from Gannet Rock daybeacon. You steer 304°T at 8.3 kn through the water. At 1350 a new fix puts you 037°T, 3.1 nm from Westfield church spire.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1255 your fix is 254°T, 3.1 nm from Tern Island tower. You steer 184°T at 5.5 kn through the water. At 1340 a new fix puts you 077°T, 1.8 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0925 your fix is 270°T, 1.8 nm from Tern Island tower. You steer 257°T at 4.7 kn through the water. At 1000 a new fix puts you 090°T, 2.5 nm from Westfield church spire.

   Plot the 1000 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 1410 your fix is 061°T, 2.6 nm from Tern Island tower. You steer 202°T at 5.0 kn through the water. At 1440 a new fix puts you 357°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1440 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 1125 your fix is 149°T, 1.8 nm from Westfield church spire. You steer 045°T at 5.3 kn through the water. At 1210 a new fix puts you 067°T, 3.7 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1200 your fix is 006°T, 2.5 nm from Westfield church spire. You steer 096°T at 6.3 kn through the water. At 1300 a new fix puts you 256°T, 2.9 nm from Tern Island tower.

   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  

7. At 1135 your fix is 221°T, 2.0 nm from Tern Island tower. You steer 234°T at 5.4 kn through the water. At 1215 a new fix puts you 062°T, 2.1 nm from Heron Point Light.

   Plot the 1215 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 1215 your fix is 328°T, 1.8 nm from Mill stack. You steer 086°T at 7.9 kn through the water. At 1255 a new fix puts you 190°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1255 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