Worksheet 196 · Skill 5

Set and drift

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1. At 1135 your fix is 061°T, 3.5 nm from Tern Island tower. You steer 220°T at 4.8 kn through the water. At 1255 a new fix puts you 268°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 1255 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1130 your fix is 028°T, 3.8 nm from Westfield church spire. You steer 108°T at 4.1 kn through the water. At 1205 a new fix puts you 278°T, 3.6 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1220 your fix is 072°T, 3.6 nm from Westfield church spire. You steer 138°T at 6.3 kn through the water. At 1315 a new fix puts you 040°T, 1.6 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0810 your fix is 200°T, 1.7 nm from Gannet Rock daybeacon. You steer 051°T at 6.8 kn through the water. At 0840 a new fix puts you 110°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 0840 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  

5. At 1530 your fix is 074°T, 2.1 nm from Gannet Rock daybeacon. You steer 271°T at 7.2 kn through the water. At 1645 a new fix puts you 095°T, 1.8 nm from Westfield church spire.

   Plot the 1645 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  

6. At 1045 your fix is 258°T, 2.1 nm from Tern Island tower. You steer 183°T at 8.1 kn through the water. At 1115 a new fix puts you 357°T, 1.6 nm from Mill stack.

   Plot the 1115 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 1130 your fix is 254°T, 2.1 nm from Gannet Rock daybeacon. You steer 299°T at 4.1 kn through the water. At 1205 a new fix puts you 249°T, 3.7 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0900 your fix is 340°T, 1.3 nm from Tern Island tower. You steer 279°T at 7.3 kn through the water. At 0940 a new fix puts you 042°T, 3.8 nm from Westfield church spire.

   Plot the 0940 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