Worksheet 1 · Skill 5

Set and drift

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1. At 1350 your fix is 009°T, 3.3 nm from Westfield church spire. You steer 133°T at 7.2 kn through the water. At 1500 a new fix puts you 033°T, 1.1 nm from Mill stack.

   Plot the 1500 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 1355 your fix is 253°T, 2.2 nm from Gannet Rock daybeacon. You steer 308°T at 4.7 kn through the water. At 1510 a new fix puts you 053°T, 3.7 nm from Westfield church spire.

   Plot the 1510 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0900 your fix is 101°T, 2.3 nm from Westfield church spire. You steer 113°T at 6.3 kn through the water. At 1015 a new fix puts you 285°T, 2.3 nm from Kittle water tank.

   Plot the 1015 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1040 your fix is 326°T, 1.1 nm from Kittle water tank. You steer 311°T at 5.3 kn through the water. At 1145 a new fix puts you 029°T, 3.6 nm from Heron Point Light.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1455 your fix is 331°T, 2.1 nm from Tern Island tower. You steer 240°T at 5.8 kn through the water. At 1555 a new fix puts you 029°T, 3.6 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0905 your fix is 048°T, 1.3 nm from Heron Point Light. You steer 347°T at 8.8 kn through the water. At 0935 a new fix puts you 057°T, 2.0 nm from Westfield church spire.

   Plot the 0935 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 1315 your fix is 071°T, 2.9 nm from Gannet Rock daybeacon. You steer 338°T at 8.9 kn through the water. At 1345 a new fix puts you 058°T, 4.8 nm from Tern Island tower.

   Plot the 1345 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  

8. At 1200 your fix is 299°T, 3.8 nm from Tern Island tower. You steer 159°T at 7.1 kn through the water. At 1245 a new fix puts you 032°T, 2.4 nm from Mill stack.

   Plot the 1245 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