Worksheet 172 · Skill 5

Set and drift

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1. At 1110 your fix is 023°T, 2.5 nm from Westfield church spire. You steer 120°T at 8.0 kn through the water. At 1225 a new fix puts you 292°T, 1.5 nm from Kittle water tank.

   Plot the 1225 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  

2. At 1220 your fix is 029°T, 1.2 nm from Westfield church spire. You steer 099°T at 4.6 kn through the water. At 1335 a new fix puts you 315°T, 2.8 nm from Tern Island tower.

   Plot the 1335 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  

3. At 0715 your fix is 231°T, 1.8 nm from Gannet Rock daybeacon. You steer 264°T at 8.5 kn through the water. At 0745 a new fix puts you 051°T, 1.1 nm from Heron Point Light.

   Plot the 0745 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 1305 your fix is 068°T, 1.5 nm from Westfield church spire. You steer 074°T at 8.0 kn through the water. At 1405 a new fix puts you 349°T, 2.3 nm from Tern Island tower.

   Plot the 1405 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 1515 your fix is 008°T, 3.2 nm from Westfield church spire. You steer 114°T at 5.2 kn through the water. At 1620 a new fix puts you 235°T, 1.2 nm from Tern Island tower.

   Plot the 1620 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  

6. At 0810 your fix is 299°T, 1.1 nm from Gannet Rock daybeacon. You steer 241°T at 4.3 kn through the water. At 0900 a new fix puts you 055°T, 1.4 nm from Heron Point Light.

   Plot the 0900 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  

7. At 0725 your fix is 043°T, 3.5 nm from Westfield church spire. You steer 135°T at 4.4 kn through the water. At 0800 a new fix puts you 265°T, 2.8 nm from Tern Island tower.

   Plot the 0800 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 1055 your fix is 288°T, 1.5 nm from Gannet Rock daybeacon. You steer 139°T at 5.3 kn through the water. At 1130 a new fix puts you 186°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1130 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