Worksheet 704 · Skill 5

Set and drift

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1. At 1145 your fix is 273°T, 1.6 nm from Gannet Rock daybeacon. You steer 058°T at 5.1 kn through the water. At 1225 a new fix puts you 075°T, 2.0 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0810 your fix is 230°T, 2.3 nm from Tern Island tower. You steer 315°T at 6.0 kn through the water. At 0850 a new fix puts you 061°T, 3.1 nm from Westfield church spire.

   Plot the 0850 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  

3. At 1300 your fix is 050°T, 2.0 nm from Gannet Rock daybeacon. You steer 344°T at 5.0 kn through the water. At 1335 a new fix puts you 065°T, 3.9 nm from Tern Island tower.

   Plot the 1335 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  

4. At 0835 your fix is 278°T, 3.4 nm from Tern Island tower. You steer 126°T at 5.1 kn through the water. At 0945 a new fix puts you 184°T, 1.8 nm from Tern Island tower.

   Plot the 0945 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  

5. At 0730 your fix is 123°T, 1.5 nm from Tern Island tower. You steer 069°T at 5.6 kn through the water. At 0810 a new fix puts you 031°T, 3.9 nm from Gannet Rock daybeacon.

   Plot the 0810 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 0935 your fix is 338°T, 2.6 nm from Kittle water tank. You steer 275°T at 6.8 kn through the water. At 1025 a new fix puts you 062°T, 1.6 nm from Heron Point Light.

   Plot the 1025 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  

7. At 1500 your fix is 201°T, 1.6 nm from Tern Island tower. You steer 196°T at 5.2 kn through the water. At 1545 a new fix puts you 026°T, 1.7 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1510 your fix is 031°T, 3.3 nm from Heron Point Light. You steer 342°T at 5.0 kn through the water. At 1550 a new fix puts you 046°T, 4.0 nm from Westfield church spire.

   Plot the 1550 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