Worksheet 199 · Skill 5

Set and drift

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1. At 0940 your fix is 295°T, 2.1 nm from Tern Island tower. You steer 164°T at 4.9 kn through the water. At 1030 a new fix puts you 209°T, 3.2 nm from Tern Island tower.

   Plot the 1030 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  

2. At 0910 your fix is 261°T, 2.3 nm from Tern Island tower. You steer 286°T at 7.4 kn through the water. At 0940 a new fix puts you 046°T, 3.2 nm from Westfield church spire.

   Plot the 0940 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 0945 your fix is 045°T, 1.8 nm from Westfield church spire. You steer 110°T at 8.7 kn through the water. At 1015 a new fix puts you 218°T, 1.9 nm from Tern Island tower.

   Plot the 1015 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 1050 your fix is 043°T, 2.0 nm from Tern Island tower. You steer 273°T at 7.2 kn through the water. At 1145 a new fix puts you 044°T, 3.3 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0950 your fix is 011°T, 2.2 nm from Tern Island tower. You steer 102°T at 5.0 kn through the water. At 1020 a new fix puts you 052°T, 3.3 nm from Tern Island tower.

   Plot the 1020 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 059°T, 4.6 nm from Tern Island tower. You steer 179°T at 7.9 kn through the water. At 1135 a new fix puts you 084°T, 2.6 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1150 your fix is 016°T, 3.4 nm from Westfield church spire. You steer 086°T at 8.9 kn through the water. At 1220 a new fix puts you 318°T, 3.4 nm from Tern Island tower.

   Plot the 1220 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  

8. At 1440 your fix is 157°T, 2.7 nm from Tern Island tower. You steer 238°T at 7.4 kn through the water. At 1520 a new fix puts you 332°T, 2.2 nm from Mill stack.

   Plot the 1520 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