Worksheet 192 · Skill 5

Set and drift

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1. At 1045 your fix is 229°T, 3.0 nm from Tern Island tower. You steer 202°T at 4.5 kn through the water. At 1115 a new fix puts you 073°T, 2.6 nm from Heron Point Light.

   Plot the 1115 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  

2. At 1340 your fix is 015°T, 1.0 nm from Westfield church spire. You steer 054°T at 4.9 kn through the water. At 1425 a new fix puts you 063°T, 3.8 nm from Westfield church spire.

   Plot the 1425 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 1215 your fix is 043°T, 3.3 nm from Westfield church spire. You steer 140°T at 5.5 kn through the water. At 1245 a new fix puts you 251°T, 2.4 nm from Tern Island tower.

   Plot the 1245 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 0820 your fix is 013°T, 1.9 nm from Gannet Rock daybeacon. You steer 221°T at 5.9 kn through the water. At 0905 a new fix puts you 358°T, 2.3 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1435 your fix is 236°T, 1.5 nm from Tern Island tower. You steer 300°T at 5.5 kn through the water. At 1520 a new fix puts you 057°T, 3.0 nm from Westfield church spire.

   Plot the 1520 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  

6. At 0945 your fix is 211°T, 2.0 nm from Tern Island tower. You steer 326°T at 5.9 kn through the water. At 1025 a new fix puts you 307°T, 3.1 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1525 your fix is 039°T, 2.2 nm from Gannet Rock daybeacon. You steer 035°T at 5.3 kn through the water. At 1555 a new fix puts you 067°T, 4.8 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1520 your fix is 046°T, 3.0 nm from Tern Island tower. You steer 264°T at 5.6 kn through the water. At 1625 a new fix puts you 286°T, 2.9 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn