Worksheet 912 · Skill 5

Set and drift

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1. At 0810 your fix is 013°T, 1.5 nm from Heron Point Light. You steer 032°T at 6.0 kn through the water. At 0855 a new fix puts you 277°T, 3.5 nm from Tern Island tower.

   Plot the 0855 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1100 your fix is 233°T, 1.2 nm from Gannet Rock daybeacon. You steer 257°T at 5.7 kn through the water. At 1145 a new fix puts you 083°T, 1.5 nm from Heron Point Light.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1210 your fix is 011°T, 3.3 nm from Westfield church spire. You steer 147°T at 5.8 kn through the water. At 1250 a new fix puts you 101°T, 2.4 nm from Westfield church spire.

   Plot the 1250 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 0910 your fix is 359°T, 1.2 nm from Heron Point Light. You steer 096°T at 6.1 kn through the water. At 1010 a new fix puts you 251°T, 1.6 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1430 your fix is 044°T, 2.1 nm from Mill stack. You steer 315°T at 8.5 kn through the water. At 1515 a new fix puts you 043°T, 2.6 nm from Westfield church spire.

   Plot the 1515 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0935 your fix is 060°T, 3.1 nm from Westfield church spire. You steer 166°T at 5.1 kn through the water. At 1005 a new fix puts you 095°T, 3.3 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1330 your fix is 340°T, 2.4 nm from Tern Island tower. You steer 111°T at 4.4 kn through the water. At 1440 a new fix puts you 053°T, 4.3 nm from Tern Island tower.

   Plot the 1440 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  

8. At 0710 your fix is 098°T, 2.6 nm from Gannet Rock daybeacon. You steer 264°T at 4.4 kn through the water. At 0800 a new fix puts you 337°T, 1.3 nm from Gannet Rock daybeacon.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn