Worksheet 462 · Skill 5

Set and drift

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1. At 1600 your fix is 074°T, 1.4 nm from Gannet Rock daybeacon. You steer 044°T at 4.4 kn through the water. At 1635 a new fix puts you 047°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1635 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  

2. At 1355 your fix is 058°T, 2.4 nm from Gannet Rock daybeacon. You steer 329°T at 4.6 kn through the water. At 1425 a new fix puts you 068°T, 2.3 nm from Tern Island tower.

   Plot the 1425 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 1400 your fix is 043°T, 4.0 nm from Westfield church spire. You steer 091°T at 6.4 kn through the water. At 1430 a new fix puts you 338°T, 2.4 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 037°T, 4.7 nm from Gannet Rock daybeacon. You steer 258°T at 4.0 kn through the water. At 1435 a new fix puts you 078°T, 2.1 nm from Tern Island tower.

   Plot the 1435 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  

5. At 1210 your fix is 242°T, 2.7 nm from Tern Island tower. You steer 156°T at 7.5 kn through the water. At 1240 a new fix puts you 016°T, 2.0 nm from Mill stack.

   Plot the 1240 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 0905 your fix is 028°T, 1.5 nm from Kittle water tank. You steer 346°T at 4.3 kn through the water. At 1020 a new fix puts you 011°T, 2.1 nm from Gannet Rock daybeacon.

   Plot the 1020 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  

7. At 1115 your fix is 095°T, 2.7 nm from Gannet Rock daybeacon. You steer 288°T at 8.1 kn through the water. At 1205 a new fix puts you 264°T, 2.9 nm from Tern Island tower.

   Plot the 1205 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 1400 your fix is 339°T, 1.8 nm from Mill stack. You steer 085°T at 4.0 kn through the water. At 1505 a new fix puts you 107°T, 1.7 nm from Gannet Rock daybeacon.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn