Worksheet 451 · Skill 5

Set and drift

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1. At 1255 your fix is 048°T, 3.3 nm from Heron Point Light. You steer 071°T at 5.3 kn through the water. At 1400 a new fix puts you 358°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1400 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 0840 your fix is 067°T, 2.8 nm from Tern Island tower. You steer 119°T at 4.2 kn through the water. At 0915 a new fix puts you 075°T, 3.9 nm from Tern Island tower.

   Plot the 0915 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 1405 your fix is 312°T, 3.6 nm from Tern Island tower. You steer 229°T at 5.5 kn through the water. At 1455 a new fix puts you 032°T, 1.5 nm from Westfield church spire.

   Plot the 1455 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  

4. At 1510 your fix is 032°T, 2.9 nm from Tern Island tower. You steer 154°T at 4.0 kn through the water. At 1615 a new fix puts you 051°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1615 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 0950 your fix is 023°T, 2.0 nm from Kittle water tank. You steer 285°T at 7.2 kn through the water. At 1045 a new fix puts you 212°T, 3.1 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1505 your fix is 071°T, 4.9 nm from Tern Island tower. You steer 192°T at 4.5 kn through the water. At 1610 a new fix puts you 072°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1610 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 1400 your fix is 255°T, 3.1 nm from Tern Island tower. You steer 302°T at 8.7 kn through the water. At 1430 a new fix puts you 028°T, 2.2 nm from Westfield church spire.

   Plot the 1430 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  

8. At 1115 your fix is 056°T, 2.7 nm from Tern Island tower. You steer 260°T at 5.4 kn through the water. At 1220 a new fix puts you 304°T, 3.9 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn