Worksheet 673 · Skill 5

Set and drift

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1. At 0935 your fix is 238°T, 2.4 nm from Gannet Rock daybeacon. You steer 076°T at 7.5 kn through the water. At 1005 a new fix puts you 016°T, 2.1 nm from Kittle water tank.

   Plot the 1005 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  

2. At 0945 your fix is 211°T, 2.3 nm from Gannet Rock daybeacon. You steer 315°T at 8.4 kn through the water. At 1025 a new fix puts you 074°T, 3.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0830 your fix is 340°T, 1.2 nm from Gannet Rock daybeacon. You steer 266°T at 7.1 kn through the water. At 0925 a new fix puts you 039°T, 2.4 nm from Heron Point Light.

   Plot the 0925 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1520 your fix is 055°T, 4.0 nm from Westfield church spire. You steer 260°T at 4.0 kn through the water. At 1605 a new fix puts you 018°T, 2.9 nm from Westfield church spire.

   Plot the 1605 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  

5. At 1255 your fix is 236°T, 2.5 nm from Tern Island tower. You steer 303°T at 5.2 kn through the water. At 1350 a new fix puts you 085°T, 1.7 nm from Westfield church spire.

   Plot the 1350 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1400 your fix is 000°T, 3.1 nm from Mill stack. You steer 356°T at 5.2 kn through the water. At 1445 a new fix puts you 284°T, 2.5 nm from Tern Island tower.

   Plot the 1445 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  

7. At 1600 your fix is 063°T, 2.2 nm from Tern Island tower. You steer 151°T at 6.9 kn through the water. At 1630 a new fix puts you 038°T, 2.0 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0855 your fix is 206°T, 3.2 nm from Tern Island tower. You steer 349°T at 5.5 kn through the water. At 0935 a new fix puts you 306°T, 3.3 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn