Worksheet 844 · Skill 5

Set and drift

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1. At 1040 your fix is 313°T, 3.2 nm from Tern Island tower. You steer 186°T at 6.8 kn through the water. At 1125 a new fix puts you 356°T, 2.6 nm from Mill stack.

   Plot the 1125 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 1555 your fix is 334°T, 2.6 nm from Kittle water tank. You steer 046°T at 4.5 kn through the water. At 1630 a new fix puts you 076°T, 2.8 nm from Gannet Rock daybeacon.

   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  

3. At 1205 your fix is 047°T, 2.6 nm from Westfield church spire. You steer 121°T at 7.5 kn through the water. At 1315 a new fix puts you 205°T, 1.9 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0905 your fix is 261°T, 2.7 nm from Gannet Rock daybeacon. You steer 351°T at 6.3 kn through the water. At 0940 a new fix puts you 322°T, 2.7 nm from Tern Island tower.

   Plot the 0940 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  

5. At 1415 your fix is 097°T, 1.5 nm from Westfield church spire. You steer 120°T at 4.1 kn through the water. At 1455 a new fix puts you 021°T, 2.6 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0900 your fix is 045°T, 1.6 nm from Heron Point Light. You steer 305°T at 4.7 kn through the water. At 0930 a new fix puts you 154°T, 1.7 nm from Westfield church spire.

   Plot the 0930 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  

7. At 0705 your fix is 356°T, 1.4 nm from Tern Island tower. You steer 277°T at 4.2 kn through the water. At 0815 a new fix puts you 303°T, 4.5 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1205 your fix is 034°T, 2.0 nm from Westfield church spire. You steer 142°T at 4.6 kn through the water. At 1315 a new fix puts you 030°T, 1.9 nm from Mill stack.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn