Worksheet 117 · Skill 5

Set and drift

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1. At 0915 your fix is 035°T, 4.4 nm from Westfield church spire. You steer 130°T at 4.6 kn through the water. At 1015 a new fix puts you 271°T, 2.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0750 your fix is 036°T, 2.2 nm from Heron Point Light. You steer 015°T at 4.9 kn through the water. At 0825 a new fix puts you 091°T, 3.7 nm from Westfield church spire.

   Plot the 0825 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  

3. At 0945 your fix is 234°T, 1.6 nm from Tern Island tower. You steer 158°T at 5.0 kn through the water. At 1015 a new fix puts you 236°T, 1.9 nm from Gannet Rock daybeacon.

   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 1420 your fix is 094°T, 2.2 nm from Tern Island tower. You steer 223°T at 5.0 kn through the water. At 1535 a new fix puts you 048°T, 2.3 nm from Mill stack.

   Plot the 1535 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  

5. At 1410 your fix is 160°T, 1.6 nm from Westfield church spire. You steer 087°T at 7.9 kn through the water. At 1440 a new fix puts you 059°T, 3.5 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1600 your fix is 209°T, 2.9 nm from Tern Island tower. You steer 259°T at 8.3 kn through the water. At 1630 a new fix puts you 126°T, 2.0 nm from Westfield church spire.

   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  

7. At 0745 your fix is 062°T, 1.9 nm from Tern Island tower. You steer 147°T at 8.2 kn through the water. At 0820 a new fix puts you 092°T, 2.0 nm from Gannet Rock daybeacon.

   Plot the 0820 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  

8. At 1105 your fix is 051°T, 2.1 nm from Heron Point Light. You steer 318°T at 5.5 kn through the water. At 1145 a new fix puts you 073°T, 1.7 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn