Worksheet 360 · Skill 5

Set and drift

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1. At 1550 your fix is 344°T, 1.8 nm from Mill stack. You steer 319°T at 5.0 kn through the water. At 1705 a new fix puts you 098°T, 2.7 nm from Westfield church spire.

   Plot the 1705 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 1515 your fix is 299°T, 1.6 nm from Tern Island tower. You steer 254°T at 4.4 kn through the water. At 1620 a new fix puts you 057°T, 2.8 nm from Westfield church spire.

   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  

3. At 0940 your fix is 248°T, 3.2 nm from Tern Island tower. You steer 111°T at 6.5 kn through the water. At 1010 a new fix puts you 287°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1010 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 0915 your fix is 134°T, 2.6 nm from Tern Island tower. You steer 254°T at 8.7 kn through the water. At 0950 a new fix puts you 064°T, 2.1 nm from Heron Point Light.

   Plot the 0950 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 1255 your fix is 028°T, 2.7 nm from Kittle water tank. You steer 272°T at 6.4 kn through the water. At 1330 a new fix puts you 179°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1330 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  

6. At 1350 your fix is 090°T, 1.7 nm from Westfield church spire. You steer 075°T at 4.1 kn through the water. At 1445 a new fix puts you 245°T, 1.9 nm from Tern Island tower.

   Plot the 1445 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  

7. At 0900 your fix is 096°T, 2.1 nm from Westfield church spire. You steer 126°T at 6.7 kn through the water. At 0950 a new fix puts you 263°T, 2.4 nm from Gannet Rock daybeacon.

   Plot the 0950 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  

8. At 1320 your fix is 065°T, 4.6 nm from Tern Island tower. You steer 201°T at 7.1 kn through the water. At 1350 a new fix puts you 084°T, 1.9 nm from Gannet Rock daybeacon.

   Plot the 1350 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