Worksheet 770 · Skill 5

Set and drift

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1. At 1220 your fix is 038°T, 3.2 nm from Tern Island tower. You steer 264°T at 5.7 kn through the water. At 1255 a new fix puts you 336°T, 2.0 nm from Tern Island tower.

   Plot the 1255 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 0710 your fix is 311°T, 2.0 nm from Tern Island tower. You steer 190°T at 7.8 kn through the water. At 0745 a new fix puts you 016°T, 2.5 nm from Mill stack.

   Plot the 0745 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  

3. At 1405 your fix is 112°T, 1.5 nm from Gannet Rock daybeacon. You steer 019°T at 5.6 kn through the water. At 1440 a new fix puts you 046°T, 4.4 nm from Gannet Rock daybeacon.

   Plot the 1440 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  

4. At 0945 your fix is 097°T, 2.7 nm from Westfield church spire. You steer 333°T at 6.6 kn through the water. At 1025 a new fix puts you 031°T, 4.1 nm from Westfield church spire.

   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  

5. At 1135 your fix is 038°T, 2.9 nm from Gannet Rock daybeacon. You steer 247°T at 4.3 kn through the water. At 1255 a new fix puts you 227°T, 3.0 nm from Tern Island tower.

   Plot the 1255 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  

6. At 1245 your fix is 093°T, 2.5 nm from Westfield church spire. You steer 144°T at 4.0 kn through the water. At 1315 a new fix puts you 044°T, 3.0 nm from Heron Point Light.

   Plot the 1315 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 1045 your fix is 029°T, 3.7 nm from Heron Point Light. You steer 252°T at 5.2 kn through the water. At 1115 a new fix puts you 002°T, 2.2 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  

8. At 0735 your fix is 073°T, 3.1 nm from Tern Island tower. You steer 150°T at 4.2 kn through the water. At 0805 a new fix puts you 045°T, 2.0 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn