Worksheet 280 · Skill 5

Set and drift

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1. At 1220 your fix is 013°T, 1.9 nm from Kittle water tank. You steer 269°T at 7.2 kn through the water. At 1255 a new fix puts you 016°T, 2.9 nm from Mill stack.

   Plot the 1255 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 0945 your fix is 110°T, 1.9 nm from Westfield church spire. You steer 048°T at 4.3 kn through the water. At 1030 a new fix puts you 287°T, 3.5 nm from Tern Island tower.

   Plot the 1030 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  

3. At 1325 your fix is 110°T, 1.9 nm from Tern Island tower. You steer 225°T at 5.1 kn through the water. At 1425 a new fix puts you 268°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1425 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  

4. At 1600 your fix is 286°T, 3.8 nm from Tern Island tower. You steer 234°T at 4.3 kn through the water. At 1630 a new fix puts you 051°T, 1.9 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0705 your fix is 356°T, 2.1 nm from Heron Point Light. You steer 087°T at 4.9 kn through the water. At 0755 a new fix puts you 220°T, 3.2 nm from Tern Island tower.

   Plot the 0755 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1450 your fix is 290°T, 2.7 nm from Tern Island tower. You steer 218°T at 4.7 kn through the water. At 1530 a new fix puts you 029°T, 3.2 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1235 your fix is 000°T, 1.7 nm from Mill stack. You steer 085°T at 4.9 kn through the water. At 1325 a new fix puts you 211°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1325 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1345 your fix is 319°T, 2.2 nm from Tern Island tower. You steer 106°T at 4.1 kn through the water. At 1425 a new fix puts you 036°T, 1.8 nm from Tern Island tower.

   Plot the 1425 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