Worksheet 806 · Skill 5

Set and drift

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1. At 1210 your fix is 072°T, 4.6 nm from Tern Island tower. You steer 266°T at 4.8 kn through the water. At 1320 a new fix puts you 329°T, 1.2 nm from Tern Island tower.

   Plot the 1320 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 1425 your fix is 076°T, 3.5 nm from Tern Island tower. You steer 221°T at 6.1 kn through the water. At 1455 a new fix puts you 135°T, 2.5 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1310 your fix is 252°T, 3.7 nm from Tern Island tower. You steer 093°T at 8.8 kn through the water. At 1340 a new fix puts you 330°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1340 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 1535 your fix is 272°T, 2.0 nm from Tern Island tower. You steer 243°T at 8.4 kn through the water. At 1615 a new fix puts you 180°T, 1.1 nm from Westfield church spire.

   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  

5. At 0730 your fix is 062°T, 3.2 nm from Gannet Rock daybeacon. You steer 262°T at 5.8 kn through the water. At 0810 a new fix puts you 133°T, 1.4 nm from Tern Island tower.

   Plot the 0810 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 1240 your fix is 054°T, 3.6 nm from Tern Island tower. You steer 189°T at 6.8 kn through the water. At 1315 a new fix puts you 038°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1315 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  

7. At 1430 your fix is 000°T, 3.0 nm from Mill stack. You steer 274°T at 4.9 kn through the water. At 1530 a new fix puts you 164°T, 1.2 nm from Westfield church spire.

   Plot the 1530 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  

8. At 1000 your fix is 029°T, 1.9 nm from Westfield church spire. You steer 150°T at 5.7 kn through the water. At 1055 a new fix puts you 067°T, 1.2 nm from Heron Point Light.

   Plot the 1055 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