Worksheet 193 · Skill 5

Set and drift

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1. At 0735 your fix is 086°T, 3.4 nm from Westfield church spire. You steer 191°T at 5.6 kn through the water. At 0810 a new fix puts you 051°T, 1.5 nm from Heron Point Light.

   Plot the 0810 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 1045 your fix is 014°T, 2.5 nm from Tern Island tower. You steer 148°T at 6.4 kn through the water. At 1125 a new fix puts you 029°T, 3.0 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1345 your fix is 308°T, 3.0 nm from Tern Island tower. You steer 236°T at 6.3 kn through the water. At 1425 a new fix puts you 055°T, 2.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1350 your fix is 047°T, 4.4 nm from Westfield church spire. You steer 168°T at 4.1 kn through the water. At 1455 a new fix puts you 046°T, 2.0 nm from Heron Point Light.

   Plot the 1455 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  

5. At 0840 your fix is 014°T, 3.3 nm from Westfield church spire. You steer 098°T at 5.1 kn through the water. At 0955 a new fix puts you 277°T, 2.0 nm from Tern Island tower.

   Plot the 0955 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 0925 your fix is 043°T, 1.3 nm from Westfield church spire. You steer 348°T at 4.0 kn through the water. At 1005 a new fix puts you 031°T, 2.8 nm from Westfield church spire.

   Plot the 1005 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  

7. At 0720 your fix is 099°T, 1.8 nm from Tern Island tower. You steer 191°T at 4.0 kn through the water. At 0755 a new fix puts you 134°T, 2.5 nm from Tern Island tower.

   Plot the 0755 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 1115 your fix is 341°T, 1.0 nm from Kittle water tank. You steer 011°T at 8.5 kn through the water. At 1145 a new fix puts you 035°T, 3.5 nm from Gannet Rock daybeacon.

   Plot the 1145 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