Worksheet 181 · Skill 5

Set and drift

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1. At 0835 your fix is 341°T, 1.7 nm from Tern Island tower. You steer 095°T at 8.4 kn through the water. At 0910 a new fix puts you 064°T, 3.9 nm from Tern Island tower.

   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  

2. At 0720 your fix is 307°T, 2.9 nm from Tern Island tower. You steer 177°T at 6.3 kn through the water. At 0805 a new fix puts you 337°T, 2.1 nm from Mill stack.

   Plot the 0805 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 0735 your fix is 008°T, 3.3 nm from Westfield church spire. You steer 124°T at 7.1 kn through the water. At 0845 a new fix puts you 218°T, 1.4 nm from Tern Island tower.

   Plot the 0845 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 0800 your fix is 079°T, 3.1 nm from Westfield church spire. You steer 128°T at 5.4 kn through the water. At 0900 a new fix puts you 053°T, 2.5 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1045 your fix is 358°T, 1.1 nm from Gannet Rock daybeacon. You steer 108°T at 5.5 kn through the water. At 1115 a new fix puts you 067°T, 3.0 nm from Gannet Rock daybeacon.

   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  

6. At 1330 your fix is 312°T, 2.6 nm from Tern Island tower. You steer 209°T at 6.3 kn through the water. At 1430 a new fix puts you 349°T, 1.9 nm from Heron Point Light.

   Plot the 1430 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 1155 your fix is 209°T, 3.1 nm from Tern Island tower. You steer 061°T at 4.4 kn through the water. At 1230 a new fix puts you 126°T, 1.5 nm from Tern Island tower.

   Plot the 1230 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 0755 your fix is 098°T, 2.2 nm from Gannet Rock daybeacon. You steer 324°T at 7.6 kn through the water. At 0830 a new fix puts you 052°T, 2.9 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn