Worksheet 229 · Skill 5

Set and drift

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1. At 1220 your fix is 262°T, 1.4 nm from Tern Island tower. You steer 259°T at 5.6 kn through the water. At 1305 a new fix puts you 058°T, 1.0 nm from Westfield church spire.

   Plot the 1305 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  

2. At 1140 your fix is 007°T, 2.1 nm from Mill stack. You steer 318°T at 6.9 kn through the water. At 1235 a new fix puts you 354°T, 2.0 nm from Westfield church spire.

   Plot the 1235 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  

3. At 0815 your fix is 057°T, 3.5 nm from Gannet Rock daybeacon. You steer 254°T at 6.0 kn through the water. At 0920 a new fix puts you 214°T, 3.4 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1345 your fix is 036°T, 4.2 nm from Westfield church spire. You steer 106°T at 4.4 kn through the water. At 1440 a new fix puts you 301°T, 3.6 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1205 your fix is 248°T, 1.3 nm from Gannet Rock daybeacon. You steer 137°T at 4.8 kn through the water. At 1235 a new fix puts you 327°T, 1.1 nm from Kittle water tank.

   Plot the 1235 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 1455 your fix is 029°T, 1.1 nm from Westfield church spire. You steer 079°T at 4.3 kn through the water. At 1525 a new fix puts you 059°T, 2.1 nm from Westfield church spire.

   Plot the 1525 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 0845 your fix is 277°T, 1.5 nm from Gannet Rock daybeacon. You steer 240°T at 7.3 kn through the water. At 0925 a new fix puts you 310°T, 1.7 nm from Mill stack.

   Plot the 0925 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 0915 your fix is 136°T, 1.0 nm from Westfield church spire. You steer 071°T at 4.3 kn through the water. At 1025 a new fix puts you 209°T, 2.1 nm from Tern Island tower.

   Plot the 1025 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