Worksheet 329 · Skill 5

Set and drift

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1. At 0750 your fix is 317°T, 2.0 nm from Tern Island tower. You steer 219°T at 5.0 kn through the water. At 0905 a new fix puts you 081°T, 2.6 nm from Westfield church spire.

   Plot the 0905 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  

2. At 1415 your fix is 327°T, 3.1 nm from Kittle water tank. You steer 269°T at 5.7 kn through the water. At 1500 a new fix puts you 013°T, 2.8 nm from Mill stack.

   Plot the 1500 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  

3. At 0730 your fix is 059°T, 4.3 nm from Tern Island tower. You steer 195°T at 4.5 kn through the water. At 0840 a new fix puts you 023°T, 1.8 nm from Kittle water tank.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1010 your fix is 328°T, 1.9 nm from Tern Island tower. You steer 241°T at 4.6 kn through the water. At 1055 a new fix puts you 076°T, 3.0 nm from Westfield church spire.

   Plot the 1055 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 1005 your fix is 037°T, 4.7 nm from Gannet Rock daybeacon. You steer 195°T at 4.9 kn through the water. At 1100 a new fix puts you 337°T, 1.6 nm from Kittle water tank.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0820 your fix is 016°T, 1.6 nm from Heron Point Light. You steer 097°T at 5.5 kn through the water. At 0920 a new fix puts you 268°T, 1.5 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0940 your fix is 031°T, 1.6 nm from Heron Point Light. You steer 088°T at 6.5 kn through the water. At 1035 a new fix puts you 273°T, 0.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1015 your fix is 216°T, 2.3 nm from Tern Island tower. You steer 199°T at 5.7 kn through the water. At 1045 a new fix puts you 019°T, 1.8 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn