Worksheet 251 · Skill 5

Set and drift

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1. At 1215 your fix is 006°T, 1.9 nm from Heron Point Light. You steer 085°T at 5.6 kn through the water. At 1335 a new fix puts you 291°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1335 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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1215 your fix is 153°T, 1.0 nm from Westfield church spire. You steer 073°T at 6.6 kn through the water. At 1245 a new fix puts you 025°T, 2.8 nm from Heron Point Light.

   Plot the 1245 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 1305 your fix is 087°T, 1.7 nm from Westfield church spire. You steer 223°T at 4.0 kn through the water. At 1335 a new fix puts you 146°T, 1.3 nm from Westfield church spire.

   Plot the 1335 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 0730 your fix is 046°T, 3.4 nm from Tern Island tower. You steer 157°T at 4.2 kn through the water. At 0805 a new fix puts you 037°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0805 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 1200 your fix is 006°T, 1.3 nm from Kittle water tank. You steer 010°T at 4.7 kn through the water. At 1310 a new fix puts you 071°T, 3.2 nm from Tern Island tower.

   Plot the 1310 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  

6. At 0945 your fix is 092°T, 2.1 nm from Westfield church spire. You steer 188°T at 4.1 kn through the water. At 1015 a new fix puts you 349°T, 1.6 nm from Heron Point Light.

   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  

7. At 1035 your fix is 179°T, 1.2 nm from Westfield church spire. You steer 095°T at 6.9 kn through the water. At 1135 a new fix puts you 202°T, 1.2 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1100 your fix is 020°T, 3.6 nm from Westfield church spire. You steer 130°T at 8.2 kn through the water. At 1155 a new fix puts you 212°T, 3.3 nm from Tern Island tower.

   Plot the 1155 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