Worksheet 49 · Skill 5

Set and drift

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1. At 1020 your fix is 036°T, 4.2 nm from Westfield church spire. You steer 205°T at 4.8 kn through the water. At 1100 a new fix puts you 085°T, 1.2 nm from Westfield church spire.

   Plot the 1100 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  

2. At 1225 your fix is 257°T, 2.6 nm from Tern Island tower. You steer 288°T at 5.1 kn through the water. At 1300 a new fix puts you 057°T, 2.1 nm from Westfield church spire.

   Plot the 1300 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 0745 your fix is 208°T, 1.3 nm from Tern Island tower. You steer 204°T at 4.4 kn through the water. At 0845 a new fix puts you 016°T, 2.7 nm from Mill stack.

   Plot the 0845 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  

4. At 0835 your fix is 253°T, 2.4 nm from Gannet Rock daybeacon. You steer 313°T at 6.0 kn through the water. At 0940 a new fix puts you 052°T, 1.2 nm from Westfield church spire.

   Plot the 0940 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  

5. At 1130 your fix is 013°T, 3.2 nm from Westfield church spire. You steer 127°T at 8.1 kn through the water. At 1240 a new fix puts you 160°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 1240 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  

6. At 1325 your fix is 023°T, 2.7 nm from Mill stack. You steer 328°T at 7.7 kn through the water. At 1400 a new fix puts you 256°T, 2.7 nm from Tern Island tower.

   Plot the 1400 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 1225 your fix is 318°T, 1.6 nm from Tern Island tower. You steer 094°T at 6.1 kn through the water. At 1255 a new fix puts you 051°T, 2.9 nm from Tern Island tower.

   Plot the 1255 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  

8. At 0925 your fix is 106°T, 2.7 nm from Westfield church spire. You steer 124°T at 4.6 kn through the water. At 1030 a new fix puts you 064°T, 2.2 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn