Worksheet 12 · Skill 5

Set and drift

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1. At 1225 your fix is 084°T, 3.2 nm from Westfield church spire. You steer 110°T at 7.7 kn through the water. At 1300 a new fix puts you 180°T, 1.6 nm from Tern Island tower.

   Plot the 1300 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 1505 your fix is 268°T, 2.7 nm from Gannet Rock daybeacon. You steer 273°T at 4.5 kn through the water. At 1600 a new fix puts you 101°T, 1.9 nm from Westfield church spire.

   Plot the 1600 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 0730 your fix is 207°T, 2.4 nm from Tern Island tower. You steer 239°T at 4.1 kn through the water. At 0800 a new fix puts you 042°T, 2.8 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1055 your fix is 217°T, 1.2 nm from Gannet Rock daybeacon. You steer 294°T at 4.6 kn through the water. At 1225 a new fix puts you 088°T, 2.9 nm from Westfield church spire.

   Plot the 1225 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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1455 your fix is 287°T, 1.9 nm from Gannet Rock daybeacon. You steer 287°T at 5.7 kn through the water. At 1530 a new fix puts you 272°T, 3.5 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1505 your fix is 357°T, 3.3 nm from Mill stack. You steer 295°T at 6.4 kn through the water. At 1545 a new fix puts you 076°T, 1.9 nm from Westfield church spire.

   Plot the 1545 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 0710 your fix is 343°T, 2.3 nm from Tern Island tower. You steer 236°T at 8.5 kn through the water. At 0745 a new fix puts you 070°T, 3.1 nm from Westfield church spire.

   Plot the 0745 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 0715 your fix is 093°T, 2.2 nm from Gannet Rock daybeacon. You steer 334°T at 8.2 kn through the water. At 0750 a new fix puts you 077°T, 2.2 nm from Tern Island tower.

   Plot the 0750 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