Worksheet 836 · Skill 5

Set and drift

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1. At 1510 your fix is 341°T, 2.6 nm from Mill stack. You steer 074°T at 5.5 kn through the water. At 1555 a new fix puts you 325°T, 1.6 nm from Kittle water tank.

   Plot the 1555 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  

2. At 1035 your fix is 014°T, 2.5 nm from Tern Island tower. You steer 147°T at 5.2 kn through the water. At 1105 a new fix puts you 074°T, 1.3 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1105 your fix is 031°T, 2.5 nm from Mill stack. You steer 309°T at 8.7 kn through the water. At 1145 a new fix puts you 081°T, 2.7 nm from Westfield church spire.

   Plot the 1145 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  

4. At 0750 your fix is 055°T, 3.4 nm from Westfield church spire. You steer 143°T at 5.8 kn through the water. At 0835 a new fix puts you 245°T, 3.3 nm from Tern Island tower.

   Plot the 0835 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 0740 your fix is 294°T, 2.0 nm from Tern Island tower. You steer 219°T at 4.4 kn through the water. At 0820 a new fix puts you 043°T, 3.3 nm from Heron Point Light.

   Plot the 0820 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  

6. At 0950 your fix is 273°T, 1.8 nm from Tern Island tower. You steer 274°T at 5.5 kn through the water. At 1020 a new fix puts you 288°T, 4.0 nm from Tern Island tower.

   Plot the 1020 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 1205 your fix is 302°T, 4.6 nm from Tern Island tower. You steer 088°T at 4.4 kn through the water. At 1250 a new fix puts you 333°T, 1.8 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0930 your fix is 067°T, 1.7 nm from Westfield church spire. You steer 131°T at 6.2 kn through the water. At 1040 a new fix puts you 063°T, 2.5 nm from Mill stack.

   Plot the 1040 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