Worksheet 705 · Skill 5

Set and drift

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1. At 1350 your fix is 041°T, 4.0 nm from Westfield church spire. You steer 187°T at 4.0 kn through the water. At 1450 a new fix puts you 123°T, 2.0 nm from Westfield church spire.

   Plot the 1450 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  

2. At 1345 your fix is 294°T, 4.3 nm from Tern Island tower. You steer 095°T at 6.6 kn through the water. At 1430 a new fix puts you 053°T, 1.6 nm from Tern Island tower.

   Plot the 1430 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 1600 your fix is 028°T, 1.9 nm from Kittle water tank. You steer 345°T at 4.1 kn through the water. At 1640 a new fix puts you 083°T, 2.6 nm from Gannet Rock daybeacon.

   Plot the 1640 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  

4. At 0755 your fix is 356°T, 1.5 nm from Tern Island tower. You steer 269°T at 8.0 kn through the water. At 0835 a new fix puts you 022°T, 1.5 nm from Westfield church spire.

   Plot the 0835 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 1135 your fix is 012°T, 2.6 nm from Mill stack. You steer 359°T at 8.2 kn through the water. At 1215 a new fix puts you 314°T, 2.5 nm from Tern Island tower.

   Plot the 1215 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 1030 your fix is 007°T, 2.2 nm from Tern Island tower. You steer 106°T at 5.5 kn through the water. At 1100 a new fix puts you 080°T, 2.3 nm from Tern Island tower.

   Plot the 1100 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 1355 your fix is 040°T, 0.9 nm from Heron Point Light. You steer 117°T at 6.0 kn through the water. At 1430 a new fix puts you 049°T, 1.9 nm from Mill stack.

   Plot the 1430 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 1440 your fix is 054°T, 2.4 nm from Westfield church spire. You steer 162°T at 5.2 kn through the water. At 1540 a new fix puts you 048°T, 3.2 nm from Heron Point Light.

   Plot the 1540 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