Worksheet 64 · Skill 5

Set and drift

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1. At 1345 your fix is 300°T, 1.5 nm from Gannet Rock daybeacon. You steer 278°T at 4.9 kn through the water. At 1425 a new fix puts you 228°T, 2.8 nm from Tern Island tower.

   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  

2. At 0815 your fix is 343°T, 2.0 nm from Mill stack. You steer 092°T at 4.2 kn through the water. At 0855 a new fix puts you 227°T, 2.1 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1205 your fix is 243°T, 2.5 nm from Tern Island tower. You steer 028°T at 6.2 kn through the water. At 1235 a new fix puts you 343°T, 2.1 nm from Tern Island tower.

   Plot the 1235 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 1150 your fix is 043°T, 2.6 nm from Heron Point Light. You steer 121°T at 7.0 kn through the water. At 1230 a new fix puts you 234°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 1230 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  

5. At 0935 your fix is 003°T, 1.8 nm from Westfield church spire. You steer 081°T at 5.7 kn through the water. At 1005 a new fix puts you 052°T, 2.9 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  

6. At 1100 your fix is 253°T, 3.4 nm from Tern Island tower. You steer 095°T at 4.8 kn through the water. At 1130 a new fix puts you 202°T, 2.5 nm from Tern Island tower.

   Plot the 1130 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 1130 your fix is 072°T, 2.2 nm from Westfield church spire. You steer 111°T at 4.0 kn through the water. At 1215 a new fix puts you 206°T, 2.8 nm from Tern Island tower.

   Plot the 1215 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  

8. At 0715 your fix is 340°T, 1.8 nm from Heron Point Light. You steer 079°T at 4.3 kn through the water. At 0810 a new fix puts you 059°T, 2.8 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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn