Worksheet 393 · Skill 5

Set and drift

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1. At 1505 your fix is 128°T, 1.1 nm from Westfield church spire. You steer 032°T at 5.4 kn through the water. At 1535 a new fix puts you 061°T, 2.5 nm from Westfield church spire.

   Plot the 1535 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 1505 your fix is 041°T, 1.5 nm from Tern Island tower. You steer 156°T at 6.1 kn through the water. At 1545 a new fix puts you 096°T, 1.6 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0725 your fix is 198°T, 2.1 nm from Gannet Rock daybeacon. You steer 283°T at 6.3 kn through the water. At 0755 a new fix puts you 351°T, 3.3 nm from Mill stack.

   Plot the 0755 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 1350 your fix is 312°T, 1.7 nm from Tern Island tower. You steer 079°T at 5.2 kn through the water. At 1430 a new fix puts you 062°T, 4.2 nm from Tern Island tower.

   Plot the 1430 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  

5. At 1430 your fix is 130°T, 3.1 nm from Tern Island tower. You steer 273°T at 6.0 kn through the water. At 1520 a new fix puts you 261°T, 2.7 nm from Tern Island tower.

   Plot the 1520 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  

6. At 0840 your fix is 042°T, 2.0 nm from Tern Island tower. You steer 143°T at 4.3 kn through the water. At 0920 a new fix puts you 027°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 0920 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  

7. At 1520 your fix is 310°T, 3.3 nm from Tern Island tower. You steer 165°T at 8.6 kn through the water. At 1605 a new fix puts you 012°T, 2.6 nm from Mill stack.

   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  

8. At 1310 your fix is 351°T, 2.0 nm from Mill stack. You steer 096°T at 4.6 kn through the water. At 1405 a new fix puts you 336°T, 1.0 nm from Kittle water tank.

   Plot the 1405 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