Worksheet 884 · Skill 5

Set and drift

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1. At 1340 your fix is 077°T, 1.3 nm from Heron Point Light. You steer 010°T at 5.5 kn through the water. At 1450 a new fix puts you 280°T, 2.8 nm from Tern Island tower.

   Plot the 1450 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  

2. At 1325 your fix is 090°T, 3.0 nm from Westfield church spire. You steer 303°T at 5.2 kn through the water. At 1355 a new fix puts you 037°T, 2.8 nm from Westfield church spire.

   Plot the 1355 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 0815 your fix is 093°T, 2.0 nm from Heron Point Light. You steer 054°T at 4.3 kn through the water. At 0945 a new fix puts you 189°T, 1.2 nm from Gannet Rock daybeacon.

   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 90 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0850 your fix is 008°T, 1.7 nm from Westfield church spire. You steer 124°T at 6.9 kn through the water. At 0950 a new fix puts you 240°T, 3.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1135 your fix is 096°T, 2.7 nm from Gannet Rock daybeacon. You steer 316°T at 5.8 kn through the water. At 1210 a new fix puts you 002°T, 1.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0835 your fix is 049°T, 2.3 nm from Tern Island tower. You steer 279°T at 8.3 kn through the water. At 0905 a new fix puts you 313°T, 3.5 nm from Tern Island tower.

   Plot the 0905 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 1015 your fix is 028°T, 3.0 nm from Westfield church spire. You steer 083°T at 4.6 kn through the water. At 1125 a new fix puts you 029°T, 2.9 nm from Tern Island tower.

   Plot the 1125 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  

8. At 0910 your fix is 081°T, 2.7 nm from Tern Island tower. You steer 163°T at 4.7 kn through the water. At 0945 a new fix puts you 345°T, 3.0 nm from Kittle water tank.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn