Worksheet 714 · Skill 5

Set and drift

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1. At 1120 your fix is 247°T, 1.6 nm from Gannet Rock daybeacon. You steer 110°T at 7.4 kn through the water. At 1155 a new fix puts you 071°T, 1.4 nm from Kittle water tank.

   Plot the 1155 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 0935 your fix is 031°T, 2.6 nm from Westfield church spire. You steer 114°T at 4.7 kn through the water. At 1040 a new fix puts you 236°T, 2.9 nm from Tern Island tower.

   Plot the 1040 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  

3. At 0850 your fix is 324°T, 3.1 nm from Tern Island tower. You steer 113°T at 4.9 kn through the water. At 0935 a new fix puts you 066°T, 2.5 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1425 your fix is 066°T, 2.3 nm from Heron Point Light. You steer 071°T at 4.2 kn through the water. At 1515 a new fix puts you 332°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1515 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  

5. At 1405 your fix is 308°T, 2.6 nm from Tern Island tower. You steer 215°T at 6.7 kn through the water. At 1445 a new fix puts you 052°T, 2.8 nm from Heron Point Light.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1145 your fix is 012°T, 2.4 nm from Westfield church spire. You steer 111°T at 4.1 kn through the water. At 1245 a new fix puts you 074°T, 3.6 nm from Westfield church spire.

   Plot the 1245 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  

7. At 1045 your fix is 305°T, 3.9 nm from Tern Island tower. You steer 232°T at 4.6 kn through the water. At 1135 a new fix puts you 010°T, 1.3 nm from Westfield church spire.

   Plot the 1135 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 1420 your fix is 046°T, 2.3 nm from Westfield church spire. You steer 182°T at 4.6 kn through the water. At 1500 a new fix puts you 160°T, 1.4 nm from Westfield church spire.

   Plot the 1500 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