Worksheet 386 · Skill 5

Set and drift

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1. At 1035 your fix is 169°T, 1.5 nm from Westfield church spire. You steer 050°T at 8.4 kn through the water. At 1120 a new fix puts you 331°T, 1.4 nm from Tern Island tower.

   Plot the 1120 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  

2. At 0715 your fix is 300°T, 1.7 nm from Tern Island tower. You steer 272°T at 4.8 kn through the water. At 0750 a new fix puts you 051°T, 4.2 nm from Westfield church spire.

   Plot the 0750 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  

3. At 1135 your fix is 355°T, 1.6 nm from Tern Island tower. You steer 247°T at 4.9 kn through the water. At 1210 a new fix puts you 268°T, 2.9 nm from Tern Island tower.

   Plot the 1210 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 0720 your fix is 213°T, 2.5 nm from Tern Island tower. You steer 313°T at 4.6 kn through the water. At 0815 a new fix puts you 078°T, 2.9 nm from Westfield church spire.

   Plot the 0815 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  

5. At 1100 your fix is 250°T, 2.6 nm from Gannet Rock daybeacon. You steer 083°T at 4.0 kn through the water. At 1140 a new fix puts you 123°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1140 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 1515 your fix is 303°T, 1.7 nm from Kittle water tank. You steer 089°T at 5.5 kn through the water. At 1545 a new fix puts you 056°T, 2.1 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1310 your fix is 034°T, 1.9 nm from Kittle water tank. You steer 347°T at 4.6 kn through the water. At 1410 a new fix puts you 029°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1410 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  

8. At 0740 your fix is 052°T, 2.3 nm from Westfield church spire. You steer 161°T at 7.5 kn through the water. At 0810 a new fix puts you 041°T, 2.3 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn