Worksheet 401 · Skill 5

Set and drift

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1. At 1100 your fix is 108°T, 2.4 nm from Westfield church spire. You steer 111°T at 5.9 kn through the water. At 1145 a new fix puts you 200°T, 1.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0900 your fix is 034°T, 2.3 nm from Kittle water tank. You steer 005°T at 4.4 kn through the water. At 1005 a new fix puts you 062°T, 3.6 nm from Tern Island tower.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0750 your fix is 329°T, 2.3 nm from Tern Island tower. You steer 255°T at 6.2 kn through the water. At 0820 a new fix puts you 274°T, 3.5 nm from Tern Island tower.

   Plot the 0820 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 1315 your fix is 046°T, 4.0 nm from Gannet Rock daybeacon. You steer 175°T at 4.8 kn through the water. At 1350 a new fix puts you 085°T, 2.0 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1110 your fix is 016°T, 2.1 nm from Tern Island tower. You steer 142°T at 5.7 kn through the water. At 1145 a new fix puts you 008°T, 1.8 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1125 your fix is 332°T, 1.4 nm from Gannet Rock daybeacon. You steer 108°T at 5.4 kn through the water. At 1200 a new fix puts you 102°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1200 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  

7. At 1100 your fix is 040°T, 2.2 nm from Gannet Rock daybeacon. You steer 009°T at 4.2 kn through the water. At 1135 a new fix puts you 069°T, 5.2 nm from Tern Island tower.

   Plot the 1135 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 0715 your fix is 133°T, 1.2 nm from Westfield church spire. You steer 038°T at 8.5 kn through the water. At 0745 a new fix puts you 047°T, 4.3 nm from Westfield church spire.

   Plot the 0745 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