Worksheet 634 · Skill 5

Set and drift

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1. At 1510 your fix is 247°T, 2.2 nm from Gannet Rock daybeacon. You steer 029°T at 5.5 kn through the water. At 1540 a new fix puts you 004°T, 1.1 nm from Gannet Rock daybeacon.

   Plot the 1540 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  

2. At 0925 your fix is 130°T, 2.1 nm from Westfield church spire. You steer 012°T at 6.2 kn through the water. At 0955 a new fix puts you 039°T, 1.8 nm from Westfield church spire.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1055 your fix is 327°T, 2.8 nm from Kittle water tank. You steer 281°T at 6.2 kn through the water. At 1135 a new fix puts you 232°T, 3.5 nm from Tern Island tower.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1600 your fix is 317°T, 1.1 nm from Gannet Rock daybeacon. You steer 210°T at 4.9 kn through the water. At 1630 a new fix puts you 047°T, 1.9 nm from Mill stack.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1515 your fix is 325°T, 2.1 nm from Tern Island tower. You steer 086°T at 4.8 kn through the water. At 1610 a new fix puts you 058°T, 4.7 nm from Tern Island tower.

   Plot the 1610 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  

6. At 1210 your fix is 060°T, 2.8 nm from Westfield church spire. You steer 341°T at 4.1 kn through the water. At 1240 a new fix puts you 036°T, 3.8 nm from Westfield church spire.

   Plot the 1240 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 1255 your fix is 252°T, 3.4 nm from Tern Island tower. You steer 054°T at 5.9 kn through the water. At 1335 a new fix puts you 339°T, 1.6 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1020 your fix is 017°T, 3.7 nm from Westfield church spire. You steer 151°T at 5.1 kn through the water. At 1120 a new fix puts you 030°T, 3.7 nm from Heron Point Light.

   Plot the 1120 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