Worksheet 120 · Skill 5

Set and drift

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1. At 1230 your fix is 038°T, 2.0 nm from Mill stack. You steer 307°T at 6.2 kn through the water. At 1330 a new fix puts you 081°T, 1.2 nm from Westfield church spire.

   Plot the 1330 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  

2. At 0700 your fix is 354°T, 2.0 nm from Heron Point Light. You steer 122°T at 4.0 kn through the water. At 0755 a new fix puts you 327°T, 1.1 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0955 your fix is 009°T, 1.7 nm from Kittle water tank. You steer 329°T at 7.6 kn through the water. At 1025 a new fix puts you 077°T, 2.2 nm from Tern Island tower.

   Plot the 1025 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 1035 your fix is 269°T, 2.2 nm from Tern Island tower. You steer 154°T at 6.1 kn through the water. At 1120 a new fix puts you 221°T, 1.0 nm from Gannet Rock daybeacon.

   Plot the 1120 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  

5. At 1145 your fix is 037°T, 2.4 nm from Mill stack. You steer 276°T at 4.5 kn through the water. At 1250 a new fix puts you 011°T, 1.7 nm from Heron Point Light.

   Plot the 1250 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  

6. At 0705 your fix is 083°T, 3.2 nm from Westfield church spire. You steer 224°T at 6.6 kn through the water. At 0735 a new fix puts you 346°T, 1.9 nm from Heron Point Light.

   Plot the 0735 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 1325 your fix is 013°T, 2.8 nm from Mill stack. You steer 044°T at 6.8 kn through the water. At 1415 a new fix puts you 115°T, 1.4 nm from Tern Island tower.

   Plot the 1415 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  

8. At 1455 your fix is 032°T, 1.6 nm from Gannet Rock daybeacon. You steer 229°T at 6.2 kn through the water. At 1540 a new fix puts you 253°T, 2.7 nm from Gannet Rock daybeacon.

   Plot the 1540 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