Worksheet 717 · Skill 5

Set and drift

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1. At 1550 your fix is 048°T, 3.0 nm from Gannet Rock daybeacon. You steer 263°T at 4.3 kn through the water. At 1630 a new fix puts you 137°T, 2.4 nm from Tern Island tower.

   Plot the 1630 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  

2. At 1105 your fix is 088°T, 1.3 nm from Heron Point Light. You steer 025°T at 8.7 kn through the water. At 1145 a new fix puts you 293°T, 2.8 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1320 your fix is 039°T, 1.2 nm from Kittle water tank. You steer 339°T at 6.9 kn through the water. At 1420 a new fix puts you 026°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1420 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  

4. At 1205 your fix is 185°T, 1.4 nm from Gannet Rock daybeacon. You steer 300°T at 7.2 kn through the water. At 1315 a new fix puts you 003°T, 2.6 nm from Westfield church spire.

   Plot the 1315 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  

5. At 1600 your fix is 017°T, 1.6 nm from Kittle water tank. You steer 258°T at 7.6 kn through the water. At 1645 a new fix puts you 341°T, 1.5 nm from Mill stack.

   Plot the 1645 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 1325 your fix is 308°T, 2.3 nm from Tern Island tower. You steer 085°T at 6.4 kn through the water. At 1430 a new fix puts you 049°T, 3.3 nm from Tern Island tower.

   Plot the 1430 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0805 your fix is 091°T, 1.0 nm from Heron Point Light. You steer 084°T at 6.5 kn through the water. At 0855 a new fix puts you 300°T, 1.6 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1015 your fix is 018°T, 1.2 nm from Westfield church spire. You steer 115°T at 5.5 kn through the water. At 1110 a new fix puts you 245°T, 2.4 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn