Worksheet 289 · Skill 5

Set and drift

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1. At 1355 your fix is 097°T, 2.2 nm from Gannet Rock daybeacon. You steer 320°T at 5.3 kn through the water. At 1505 a new fix puts you 020°T, 2.5 nm from Tern Island tower.

   Plot the 1505 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  

2. At 1435 your fix is 242°T, 2.6 nm from Gannet Rock daybeacon. You steer 082°T at 5.5 kn through the water. At 1505 a new fix puts you 345°T, 2.7 nm from Kittle water tank.

   Plot the 1505 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  

3. At 0940 your fix is 209°T, 2.1 nm from Tern Island tower. You steer 305°T at 6.6 kn through the water. At 1025 a new fix puts you 301°T, 4.2 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1505 your fix is 206°T, 3.2 nm from Tern Island tower. You steer 303°T at 6.5 kn through the water. At 1555 a new fix puts you 071°T, 2.4 nm from Westfield church spire.

   Plot the 1555 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  

5. At 1140 your fix is 032°T, 2.6 nm from Heron Point Light. You steer 269°T at 4.0 kn through the water. At 1225 a new fix puts you 339°T, 2.0 nm from Heron Point Light.

   Plot the 1225 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 0835 your fix is 059°T, 3.2 nm from Heron Point Light. You steer 118°T at 4.6 kn through the water. At 0915 a new fix puts you 231°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0915 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 1035 your fix is 328°T, 2.0 nm from Mill stack. You steer 336°T at 6.8 kn through the water. At 1135 a new fix puts you 298°T, 4.0 nm from Tern Island tower.

   Plot the 1135 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  

8. At 1020 your fix is 308°T, 1.6 nm from Kittle water tank. You steer 311°T at 5.4 kn through the water. At 1110 a new fix puts you 236°T, 3.2 nm from Tern Island tower.

   Plot the 1110 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