Worksheet 137 · Skill 5

Set and drift

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1. At 1200 your fix is 242°T, 1.6 nm from Gannet Rock daybeacon. You steer 095°T at 4.7 kn through the water. At 1300 a new fix puts you 349°T, 1.3 nm from Kittle water tank.

   Plot the 1300 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  

2. At 1440 your fix is 012°T, 1.6 nm from Heron Point Light. You steer 099°T at 5.8 kn through the water. At 1605 a new fix puts you 034°T, 1.7 nm from Kittle water tank.

   Plot the 1605 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  

3. At 1455 your fix is 087°T, 2.3 nm from Westfield church spire. You steer 171°T at 5.7 kn through the water. At 1525 a new fix puts you 049°T, 1.6 nm from Heron Point Light.

   Plot the 1525 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 0810 your fix is 131°T, 2.7 nm from Tern Island tower. You steer 273°T at 8.2 kn through the water. At 0850 a new fix puts you 079°T, 3.1 nm from Westfield church spire.

   Plot the 0850 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 0750 your fix is 065°T, 2.8 nm from Heron Point Light. You steer 091°T at 8.5 kn through the water. At 0830 a new fix puts you 103°T, 2.3 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1115 your fix is 049°T, 2.9 nm from Gannet Rock daybeacon. You steer 168°T at 5.4 kn through the water. At 1155 a new fix puts you 013°T, 1.6 nm from Kittle water tank.

   Plot the 1155 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 0845 your fix is 004°T, 2.8 nm from Mill stack. You steer 314°T at 4.5 kn through the water. At 0955 a new fix puts you 003°T, 3.0 nm from Westfield church spire.

   Plot the 0955 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  

8. At 1205 your fix is 109°T, 1.9 nm from Westfield church spire. You steer 034°T at 5.8 kn through the water. At 1250 a new fix puts you 295°T, 3.4 nm from Tern Island tower.

   Plot the 1250 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