Worksheet 461 · Skill 5

Set and drift

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1. At 0740 your fix is 084°T, 1.4 nm from Westfield church spire. You steer 108°T at 5.5 kn through the water. At 0815 a new fix puts you 252°T, 2.9 nm from Tern Island tower.

   Plot the 0815 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  

2. At 1510 your fix is 147°T, 1.4 nm from Gannet Rock daybeacon. You steer 078°T at 4.1 kn through the water. At 1540 a new fix puts you 084°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1540 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  

3. At 0755 your fix is 295°T, 1.5 nm from Gannet Rock daybeacon. You steer 225°T at 4.3 kn through the water. At 0825 a new fix puts you 010°T, 1.9 nm from Mill stack.

   Plot the 0825 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  

4. At 1110 your fix is 256°T, 2.9 nm from Gannet Rock daybeacon. You steer 310°T at 4.7 kn through the water. At 1210 a new fix puts you 280°T, 3.0 nm from Tern Island tower.

   Plot the 1210 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 1515 your fix is 351°T, 1.0 nm from Gannet Rock daybeacon. You steer 265°T at 5.2 kn through the water. At 1555 a new fix puts you 217°T, 2.7 nm from Tern Island tower.

   Plot the 1555 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  

6. At 1055 your fix is 342°T, 2.0 nm from Tern Island tower. You steer 206°T at 4.7 kn through the water. At 1215 a new fix puts you 043°T, 3.2 nm from Heron Point Light.

   Plot the 1215 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1555 your fix is 226°T, 2.6 nm from Gannet Rock daybeacon. You steer 017°T at 5.9 kn through the water. At 1630 a new fix puts you 116°T, 1.6 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1035 your fix is 235°T, 3.4 nm from Tern Island tower. You steer 239°T at 4.5 kn through the water. At 1105 a new fix puts you 343°T, 1.4 nm from Heron Point Light.

   Plot the 1105 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