Worksheet 707 · Skill 5

Set and drift

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1. At 1045 your fix is 133°T, 1.3 nm from Westfield church spire. You steer 100°T at 6.7 kn through the water. At 1210 a new fix puts you 002°T, 0.9 nm from Kittle water tank.

   Plot the 1210 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  

2. At 0825 your fix is 072°T, 4.4 nm from Tern Island tower. You steer 297°T at 4.5 kn through the water. At 0855 a new fix puts you 039°T, 2.4 nm from Tern Island tower.

   Plot the 0855 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 1305 your fix is 333°T, 2.8 nm from Kittle water tank. You steer 268°T at 8.7 kn through the water. At 1350 a new fix puts you 025°T, 2.4 nm from Heron Point Light.

   Plot the 1350 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 1045 your fix is 121°T, 1.1 nm from Westfield church spire. You steer 101°T at 7.1 kn through the water. At 1145 a new fix puts you 305°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1145 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 1310 your fix is 015°T, 2.2 nm from Kittle water tank. You steer 274°T at 6.1 kn through the water. At 1405 a new fix puts you 219°T, 2.9 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0930 your fix is 054°T, 3.4 nm from Tern Island tower. You steer 231°T at 4.2 kn through the water. At 1000 a new fix puts you 074°T, 2.2 nm from Tern Island tower.

   Plot the 1000 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 1410 your fix is 353°T, 2.1 nm from Tern Island tower. You steer 228°T at 8.8 kn through the water. At 1440 a new fix puts you 263°T, 3.2 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0830 your fix is 213°T, 3.4 nm from Tern Island tower. You steer 312°T at 5.0 kn through the water. At 0945 a new fix puts you 026°T, 2.0 nm from Westfield church spire.

   Plot the 0945 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