Worksheet 603 · Skill 5

Set and drift

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1. At 1000 your fix is 334°T, 2.3 nm from Mill stack. You steer 338°T at 4.4 kn through the water. At 1030 a new fix puts you 089°T, 3.4 nm from Westfield church spire.

   Plot the 1030 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 1000 your fix is 204°T, 2.3 nm from Gannet Rock daybeacon. You steer 082°T at 5.5 kn through the water. At 1030 a new fix puts you 352°T, 1.5 nm from Kittle water tank.

   Plot the 1030 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  

3. At 1015 your fix is 307°T, 1.9 nm from Tern Island tower. You steer 185°T at 7.8 kn through the water. At 1045 a new fix puts you 215°T, 2.7 nm from Tern Island tower.

   Plot the 1045 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 0745 your fix is 101°T, 2.7 nm from Westfield church spire. You steer 027°T at 6.6 kn through the water. At 0815 a new fix puts you 289°T, 3.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0835 your fix is 029°T, 2.9 nm from Heron Point Light. You steer 102°T at 7.6 kn through the water. At 0935 a new fix puts you 159°T, 3.1 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1000 your fix is 253°T, 1.4 nm from Gannet Rock daybeacon. You steer 132°T at 4.2 kn through the water. At 1030 a new fix puts you 304°T, 1.8 nm from Kittle water tank.

   Plot the 1030 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 1225 your fix is 294°T, 3.1 nm from Tern Island tower. You steer 198°T at 4.3 kn through the water. At 1335 a new fix puts you 059°T, 1.9 nm from Heron Point Light.

   Plot the 1335 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 0905 your fix is 062°T, 1.3 nm from Gannet Rock daybeacon. You steer 024°T at 4.7 kn through the water. At 0950 a new fix puts you 033°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 0950 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