Worksheet 265 · Skill 5

Set and drift

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1. At 1335 your fix is 274°T, 3.5 nm from Tern Island tower. You steer 127°T at 6.9 kn through the water. At 1405 a new fix puts you 194°T, 1.2 nm from Tern Island tower.

   Plot the 1405 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 0855 your fix is 038°T, 1.9 nm from Heron Point Light. You steer 072°T at 4.6 kn through the water. At 1010 a new fix puts you 042°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1010 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0930 your fix is 036°T, 4.0 nm from Westfield church spire. You steer 101°T at 5.6 kn through the water. At 1045 a new fix puts you 049°T, 2.3 nm from Tern Island tower.

   Plot the 1045 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 75 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0745 your fix is 292°T, 3.9 nm from Tern Island tower. You steer 144°T at 5.6 kn through the water. At 0845 a new fix puts you 226°T, 3.1 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1320 your fix is 020°T, 2.8 nm from Heron Point Light. You steer 053°T at 4.0 kn through the water. At 1445 a new fix puts you 299°T, 3.5 nm from Tern Island tower.

   Plot the 1445 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0940 your fix is 011°T, 1.9 nm from Kittle water tank. You steer 017°T at 8.7 kn through the water. At 1015 a new fix puts you 041°T, 4.0 nm from Gannet Rock daybeacon.

   Plot the 1015 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 1205 your fix is 053°T, 3.3 nm from Heron Point Light. You steer 349°T at 4.0 kn through the water. At 1245 a new fix puts you 255°T, 3.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1405 your fix is 123°T, 1.3 nm from Westfield church spire. You steer 138°T at 4.4 kn through the water. At 1450 a new fix puts you 047°T, 1.4 nm from Heron Point Light.

   Plot the 1450 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