Worksheet 506 · Skill 5

Set and drift

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1. At 1125 your fix is 335°T, 1.4 nm from Kittle water tank. You steer 270°T at 7.1 kn through the water. At 1200 a new fix puts you 047°T, 1.8 nm from Mill stack.

   Plot the 1200 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  

2. At 0845 your fix is 069°T, 4.9 nm from Tern Island tower. You steer 233°T at 4.7 kn through the water. At 0930 a new fix puts you 028°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 0930 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 1020 your fix is 042°T, 4.1 nm from Westfield church spire. You steer 094°T at 9.0 kn through the water. At 1110 a new fix puts you 029°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1110 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 1110 your fix is 064°T, 3.1 nm from Westfield church spire. You steer 162°T at 7.6 kn through the water. At 1140 a new fix puts you 053°T, 3.4 nm from Heron Point Light.

   Plot the 1140 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  

5. At 0800 your fix is 030°T, 3.5 nm from Heron Point Light. You steer 054°T at 4.5 kn through the water. At 0835 a new fix puts you 264°T, 1.8 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1505 your fix is 233°T, 1.2 nm from Gannet Rock daybeacon. You steer 022°T at 7.3 kn through the water. At 1540 a new fix puts you 060°T, 2.5 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0825 your fix is 156°T, 2.9 nm from Tern Island tower. You steer 219°T at 4.7 kn through the water. At 0900 a new fix puts you 043°T, 1.2 nm from Mill stack.

   Plot the 0900 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  

8. At 1540 your fix is 038°T, 2.4 nm from Mill stack. You steer 312°T at 5.4 kn through the water. At 1625 a new fix puts you 239°T, 3.3 nm from Tern Island tower.

   Plot the 1625 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