Worksheet 600 · Skill 5

Set and drift

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1. At 1105 your fix is 050°T, 0.9 nm from Heron Point Light. You steer 039°T at 6.1 kn through the water. At 1140 a new fix puts you 234°T, 2.7 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1020 your fix is 328°T, 1.9 nm from Heron Point Light. You steer 073°T at 6.9 kn through the water. At 1050 a new fix puts you 247°T, 2.6 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  

3. At 1010 your fix is 023°T, 1.6 nm from Heron Point Light. You steer 106°T at 4.5 kn through the water. At 1130 a new fix puts you 195°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1130 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0835 your fix is 305°T, 3.4 nm from Tern Island tower. You steer 201°T at 7.1 kn through the water. At 0910 a new fix puts you 119°T, 2.2 nm from Westfield church spire.

   Plot the 0910 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 1305 your fix is 030°T, 2.1 nm from Heron Point Light. You steer 101°T at 4.2 kn through the water. At 1335 a new fix puts you 224°T, 3.4 nm from Tern Island tower.

   Plot the 1335 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  

6. At 0800 your fix is 268°T, 3.2 nm from Tern Island tower. You steer 195°T at 6.1 kn through the water. At 0830 a new fix puts you 029°T, 2.5 nm from Heron Point Light.

   Plot the 0830 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 1235 your fix is 095°T, 2.4 nm from Westfield church spire. You steer 049°T at 8.5 kn through the water. At 1310 a new fix puts you 310°T, 2.3 nm from Tern Island tower.

   Plot the 1310 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 1105 your fix is 016°T, 3.0 nm from Westfield church spire. You steer 127°T at 6.0 kn through the water. At 1155 a new fix puts you 047°T, 3.0 nm from Heron Point Light.

   Plot the 1155 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