Worksheet 387 · Skill 5

Set and drift

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1. At 0820 your fix is 093°T, 3.5 nm from Westfield church spire. You steer 299°T at 5.3 kn through the water. At 0900 a new fix puts you 040°T, 2.0 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0900 your fix is 060°T, 3.3 nm from Westfield church spire. You steer 179°T at 6.2 kn through the water. At 0935 a new fix puts you 084°T, 1.5 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1520 your fix is 254°T, 1.1 nm from Gannet Rock daybeacon. You steer 282°T at 5.7 kn through the water. At 1630 a new fix puts you 254°T, 3.3 nm from Tern Island tower.

   Plot the 1630 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  

4. At 1500 your fix is 002°T, 1.2 nm from Kittle water tank. You steer 280°T at 4.8 kn through the water. At 1535 a new fix puts you 274°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1535 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  

5. At 0825 your fix is 033°T, 2.1 nm from Mill stack. You steer 325°T at 4.2 kn through the water. At 0915 a new fix puts you 231°T, 2.7 nm from Tern Island tower.

   Plot the 0915 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  

6. At 1220 your fix is 189°T, 1.4 nm from Gannet Rock daybeacon. You steer 301°T at 9.0 kn through the water. At 1255 a new fix puts you 227°T, 3.3 nm from Tern Island tower.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1230 your fix is 097°T, 1.4 nm from Westfield church spire. You steer 086°T at 4.3 kn through the water. At 1325 a new fix puts you 046°T, 2.6 nm from Heron Point Light.

   Plot the 1325 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  

8. At 1425 your fix is 234°T, 3.5 nm from Tern Island tower. You steer 343°T at 5.2 kn through the water. At 1455 a new fix puts you 062°T, 3.9 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn