Worksheet 468 · Skill 5

Set and drift

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1. At 1005 your fix is 155°T, 2.0 nm from Westfield church spire. You steer 012°T at 8.7 kn through the water. At 1035 a new fix puts you 027°T, 4.0 nm from Westfield church spire.

   Plot the 1035 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  

2. At 0915 your fix is 025°T, 2.7 nm from Westfield church spire. You steer 082°T at 7.9 kn through the water. At 0950 a new fix puts you 311°T, 1.8 nm from Tern Island tower.

   Plot the 0950 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1155 your fix is 242°T, 3.1 nm from Tern Island tower. You steer 095°T at 4.9 kn through the water. At 1230 a new fix puts you 196°T, 2.3 nm from Tern Island tower.

   Plot the 1230 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1505 your fix is 018°T, 2.5 nm from Heron Point Light. You steer 096°T at 8.2 kn through the water. At 1545 a new fix puts you 252°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 1545 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 1235 your fix is 028°T, 1.2 nm from Heron Point Light. You steer 079°T at 4.7 kn through the water. At 1315 a new fix puts you 353°T, 3.5 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0840 your fix is 086°T, 1.7 nm from Westfield church spire. You steer 088°T at 5.0 kn through the water. At 0935 a new fix puts you 237°T, 2.1 nm from Tern Island tower.

   Plot the 0935 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  

7. At 1355 your fix is 354°T, 1.8 nm from Heron Point Light. You steer 353°T at 4.4 kn through the water. At 1445 a new fix puts you 031°T, 3.6 nm from Westfield church spire.

   Plot the 1445 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 0750 your fix is 351°T, 1.0 nm from Kittle water tank. You steer 047°T at 4.0 kn through the water. At 0825 a new fix puts you 091°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0825 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn