Worksheet 842 · Skill 5

Set and drift

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1. At 1320 your fix is 095°T, 2.8 nm from Westfield church spire. You steer 339°T at 4.6 kn through the water. At 1405 a new fix puts you 030°T, 2.8 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0720 your fix is 023°T, 2.5 nm from Heron Point Light. You steer 019°T at 5.1 kn through the water. At 0810 a new fix puts you 047°T, 3.3 nm from Westfield church spire.

   Plot the 0810 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  

3. At 1545 your fix is 310°T, 3.0 nm from Tern Island tower. You steer 091°T at 4.9 kn through the water. At 1705 a new fix puts you 067°T, 2.2 nm from Tern Island tower.

   Plot the 1705 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 1515 your fix is 033°T, 1.8 nm from Kittle water tank. You steer 277°T at 5.4 kn through the water. At 1600 a new fix puts you 225°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1600 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 1425 your fix is 035°T, 2.5 nm from Gannet Rock daybeacon. You steer 157°T at 5.4 kn through the water. At 1510 a new fix puts you 053°T, 1.6 nm from Kittle water tank.

   Plot the 1510 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 1440 your fix is 227°T, 1.8 nm from Tern Island tower. You steer 356°T at 5.8 kn through the water. At 1510 a new fix puts you 297°T, 2.8 nm from Tern Island tower.

   Plot the 1510 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 1555 your fix is 046°T, 4.1 nm from Westfield church spire. You steer 228°T at 5.6 kn through the water. At 1625 a new fix puts you 018°T, 1.1 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1510 your fix is 117°T, 1.5 nm from Gannet Rock daybeacon. You steer 010°T at 4.1 kn through the water. At 1545 a new fix puts you 030°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1545 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