Worksheet 420 · Skill 5

Set and drift

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1. At 0700 your fix is 317°T, 1.3 nm from Gannet Rock daybeacon. You steer 099°T at 5.4 kn through the water. At 0740 a new fix puts you 082°T, 3.3 nm from Gannet Rock daybeacon.

   Plot the 0740 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 1035 your fix is 138°T, 1.5 nm from Gannet Rock daybeacon. You steer 007°T at 5.7 kn through the water. At 1120 a new fix puts you 075°T, 3.6 nm from Tern Island tower.

   Plot the 1120 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  

3. At 1125 your fix is 149°T, 1.6 nm from Gannet Rock daybeacon. You steer 304°T at 5.2 kn through the water. At 1250 a new fix puts you 024°T, 1.7 nm from Westfield church spire.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0955 your fix is 044°T, 1.2 nm from Westfield church spire. You steer 139°T at 4.4 kn through the water. At 1120 a new fix puts you 047°T, 3.1 nm from Heron Point Light.

   Plot the 1120 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  

5. At 1300 your fix is 042°T, 3.4 nm from Heron Point Light. You steer 134°T at 4.8 kn through the water. At 1330 a new fix puts you 022°T, 2.7 nm from Mill stack.

   Plot the 1330 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  

6. At 1315 your fix is 050°T, 1.3 nm from Kittle water tank. You steer 289°T at 4.7 kn through the water. At 1345 a new fix puts you 186°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1345 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 0805 your fix is 328°T, 1.0 nm from Kittle water tank. You steer 303°T at 4.2 kn through the water. At 0900 a new fix puts you 193°T, 2.2 nm from Tern Island tower.

   Plot the 0900 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  

8. At 0810 your fix is 237°T, 1.8 nm from Gannet Rock daybeacon. You steer 112°T at 5.0 kn through the water. At 0855 a new fix puts you 343°T, 1.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn