Worksheet 608 · Skill 5

Set and drift

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1. At 1240 your fix is 348°T, 2.3 nm from Tern Island tower. You steer 221°T at 4.5 kn through the water. At 1350 a new fix puts you 048°T, 3.4 nm from Heron Point Light.

   Plot the 1350 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  

2. At 1535 your fix is 274°T, 2.6 nm from Tern Island tower. You steer 205°T at 5.2 kn through the water. At 1615 a new fix puts you 024°T, 2.2 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1045 your fix is 303°T, 1.5 nm from Gannet Rock daybeacon. You steer 052°T at 5.4 kn through the water. At 1145 a new fix puts you 064°T, 5.1 nm from Tern Island tower.

   Plot the 1145 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1130 your fix is 284°T, 2.4 nm from Tern Island tower. You steer 154°T at 5.7 kn through the water. At 1230 a new fix puts you 293°T, 1.5 nm from Kittle water tank.

   Plot the 1230 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0705 your fix is 285°T, 0.9 nm from Gannet Rock daybeacon. You steer 267°T at 6.2 kn through the water. At 0800 a new fix puts you 071°T, 2.3 nm from Heron Point Light.

   Plot the 0800 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 0735 your fix is 083°T, 1.8 nm from Westfield church spire. You steer 093°T at 6.8 kn through the water. At 0830 a new fix puts you 295°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0830 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  

7. At 1525 your fix is 249°T, 3.3 nm from Tern Island tower. You steer 321°T at 6.5 kn through the water. At 1605 a new fix puts you 012°T, 2.9 nm from Westfield church spire.

   Plot the 1605 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 1050 your fix is 349°T, 2.4 nm from Mill stack. You steer 353°T at 6.2 kn through the water. At 1135 a new fix puts you 282°T, 1.5 nm from Tern Island tower.

   Plot the 1135 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