Worksheet 335 · Skill 5

Set and drift

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1. At 1150 your fix is 041°T, 3.7 nm from Westfield church spire. You steer 156°T at 5.3 kn through the water. At 1250 a new fix puts you 103°T, 1.5 nm from Heron Point Light.

   Plot the 1250 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 1445 your fix is 111°T, 2.1 nm from Gannet Rock daybeacon. You steer 279°T at 4.7 kn through the water. At 1600 a new fix puts you 061°T, 3.3 nm from Heron Point Light.

   Plot the 1600 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0955 your fix is 221°T, 2.0 nm from Tern Island tower. You steer 314°T at 8.6 kn through the water. At 1025 a new fix puts you 055°T, 3.9 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1435 your fix is 169°T, 1.5 nm from Gannet Rock daybeacon. You steer 313°T at 5.3 kn through the water. At 1530 a new fix puts you 242°T, 2.8 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0940 your fix is 344°T, 2.6 nm from Mill stack. You steer 327°T at 5.8 kn through the water. At 1040 a new fix puts you 051°T, 1.2 nm from Westfield church spire.

   Plot the 1040 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  

6. At 0950 your fix is 154°T, 1.3 nm from Gannet Rock daybeacon. You steer 273°T at 8.5 kn through the water. At 1040 a new fix puts you 325°T, 1.6 nm from Heron Point Light.

   Plot the 1040 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 1035 your fix is 034°T, 1.4 nm from Kittle water tank. You steer 284°T at 6.0 kn through the water. At 1145 a new fix puts you 016°T, 2.9 nm from Mill stack.

   Plot the 1145 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  

8. At 1425 your fix is 325°T, 2.9 nm from Kittle water tank. You steer 286°T at 9.0 kn through the water. At 1515 a new fix puts you 353°T, 2.0 nm from Heron Point Light.

   Plot the 1515 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