Worksheet 887 · Skill 5

Set and drift

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1. At 1540 your fix is 023°T, 3.1 nm from Heron Point Light. You steer 302°T at 4.0 kn through the water. At 1630 a new fix puts you 037°T, 2.7 nm from Westfield church spire.

   Plot the 1630 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  

2. At 1010 your fix is 017°T, 2.2 nm from Tern Island tower. You steer 272°T at 8.2 kn through the water. At 1045 a new fix puts you 056°T, 3.6 nm from Westfield church spire.

   Plot the 1045 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 1010 your fix is 062°T, 4.6 nm from Tern Island tower. You steer 251°T at 5.6 kn through the water. At 1045 a new fix puts you 038°T, 1.9 nm from Tern Island tower.

   Plot the 1045 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 0725 your fix is 114°T, 2.3 nm from Westfield church spire. You steer 080°T at 6.0 kn through the water. At 0820 a new fix puts you 258°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 0820 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  

5. At 1515 your fix is 279°T, 2.0 nm from Gannet Rock daybeacon. You steer 282°T at 5.4 kn through the water. At 1620 a new fix puts you 111°T, 1.4 nm from Westfield church spire.

   Plot the 1620 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  

6. At 0925 your fix is 229°T, 2.2 nm from Tern Island tower. You steer 262°T at 4.1 kn through the water. At 1030 a new fix puts you 087°T, 2.6 nm from Westfield church spire.

   Plot the 1030 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  

7. At 0845 your fix is 271°T, 1.9 nm from Gannet Rock daybeacon. You steer 310°T at 6.7 kn through the water. At 0920 a new fix puts you 280°T, 3.7 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1105 your fix is 044°T, 2.1 nm from Heron Point Light. You steer 071°T at 6.0 kn through the water. At 1155 a new fix puts you 182°T, 1.7 nm from Tern Island tower.

   Plot the 1155 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