Worksheet 841 · Skill 5

Set and drift

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1. At 0940 your fix is 018°T, 2.8 nm from Westfield church spire. You steer 131°T at 8.0 kn through the water. At 1045 a new fix puts you 023°T, 2.4 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0745 your fix is 064°T, 2.4 nm from Westfield church spire. You steer 116°T at 4.7 kn through the water. At 0840 a new fix puts you 237°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0840 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  

3. At 0945 your fix is 047°T, 2.6 nm from Tern Island tower. You steer 133°T at 4.7 kn through the water. At 1035 a new fix puts you 074°T, 2.3 nm from Gannet Rock daybeacon.

   Plot the 1035 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  

4. At 0725 your fix is 252°T, 2.4 nm from Tern Island tower. You steer 244°T at 6.2 kn through the water. At 0800 a new fix puts you 097°T, 1.2 nm from Westfield church spire.

   Plot the 0800 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 0855 your fix is 159°T, 0.9 nm from Westfield church spire. You steer 122°T at 6.4 kn through the water. At 0950 a new fix puts you 023°T, 1.1 nm from Mill stack.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0805 your fix is 035°T, 2.2 nm from Kittle water tank. You steer 266°T at 4.5 kn through the water. At 0920 a new fix puts you 216°T, 2.6 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1020 your fix is 017°T, 1.7 nm from Mill stack. You steer 321°T at 7.0 kn through the water. At 1105 a new fix puts you 038°T, 1.7 nm from Westfield church spire.

   Plot the 1105 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 1020 your fix is 020°T, 1.6 nm from Kittle water tank. You steer 356°T at 7.6 kn through the water. At 1050 a new fix puts you 078°T, 3.6 nm from Tern Island tower.

   Plot the 1050 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