Worksheet 662 · Skill 5

Set and drift

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1. At 1145 your fix is 029°T, 1.4 nm from Westfield church spire. You steer 098°T at 4.4 kn through the water. At 1220 a new fix puts you 081°T, 3.4 nm from Westfield church spire.

   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  

2. At 1250 your fix is 077°T, 2.2 nm from Gannet Rock daybeacon. You steer 270°T at 5.9 kn through the water. At 1355 a new fix puts you 081°T, 3.6 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  

3. At 1020 your fix is 057°T, 3.7 nm from Westfield church spire. You steer 134°T at 5.1 kn through the water. At 1125 a new fix puts you 023°T, 2.7 nm from Mill stack.

   Plot the 1125 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  

4. At 0815 your fix is 006°T, 1.9 nm from Tern Island tower. You steer 139°T at 4.7 kn through the water. At 0920 a new fix puts you 061°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

5. At 0930 your fix is 062°T, 1.7 nm from Heron Point Light. You steer 344°T at 4.3 kn through the water. At 1000 a new fix puts you 006°T, 2.3 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1330 your fix is 065°T, 1.2 nm from Gannet Rock daybeacon. You steer 328°T at 4.8 kn through the water. At 1405 a new fix puts you 115°T, 1.7 nm from Tern Island tower.

   Plot the 1405 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 1355 your fix is 109°T, 2.2 nm from Westfield church spire. You steer 000°T at 4.7 kn through the water. At 1445 a new fix puts you 042°T, 4.2 nm from Westfield church spire.

   Plot the 1445 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1440 your fix is 289°T, 1.4 nm from Tern Island tower. You steer 240°T at 5.7 kn through the water. At 1510 a new fix puts you 098°T, 3.0 nm from Westfield church spire.

   Plot the 1510 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