Worksheet 118 · Skill 5

Set and drift

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1. At 0820 your fix is 331°T, 2.3 nm from Mill stack. You steer 039°T at 4.0 kn through the water. At 0905 a new fix puts you 004°T, 3.1 nm from Mill stack.

   Plot the 0905 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 0840 your fix is 285°T, 3.4 nm from Tern Island tower. You steer 189°T at 6.3 kn through the water. At 0920 a new fix puts you 029°T, 2.1 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1010 your fix is 351°T, 2.4 nm from Tern Island tower. You steer 125°T at 6.1 kn through the water. At 1100 a new fix puts you 078°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1100 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 0940 your fix is 321°T, 3.1 nm from Tern Island tower. You steer 212°T at 5.8 kn through the water. At 1020 a new fix puts you 094°T, 3.4 nm from Westfield church spire.

   Plot the 1020 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  

5. At 0955 your fix is 305°T, 3.7 nm from Mill stack. You steer 345°T at 6.6 kn through the water. At 1040 a new fix puts you 055°T, 1.5 nm from Westfield church spire.

   Plot the 1040 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 1455 your fix is 054°T, 2.7 nm from Heron Point Light. You steer 301°T at 4.5 kn through the water. At 1535 a new fix puts you 131°T, 1.7 nm from Westfield church spire.

   Plot the 1535 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  

7. At 1155 your fix is 257°T, 2.9 nm from Gannet Rock daybeacon. You steer 355°T at 6.1 kn through the water. At 1240 a new fix puts you 296°T, 2.8 nm from Tern Island tower.

   Plot the 1240 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  

8. At 1535 your fix is 343°T, 1.3 nm from Heron Point Light. You steer 001°T at 6.5 kn through the water. At 1610 a new fix puts you 064°T, 2.2 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn