Worksheet 123 · Skill 5

Set and drift

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1. At 1150 your fix is 056°T, 3.2 nm from Gannet Rock daybeacon. You steer 260°T at 4.2 kn through the water. At 1245 a new fix puts you 104°T, 1.7 nm from Tern Island tower.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0705 your fix is 030°T, 2.6 nm from Westfield church spire. You steer 129°T at 6.8 kn through the water. At 0810 a new fix puts you 048°T, 2.3 nm from Mill stack.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0945 your fix is 274°T, 3.7 nm from Tern Island tower. You steer 143°T at 6.4 kn through the water. At 1020 a new fix puts you 263°T, 2.9 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1235 your fix is 342°T, 1.9 nm from Heron Point Light. You steer 101°T at 7.7 kn through the water. At 1335 a new fix puts you 139°T, 2.7 nm from Tern Island tower.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0845 your fix is 304°T, 3.9 nm from Tern Island tower. You steer 086°T at 5.0 kn through the water. At 0930 a new fix puts you 346°T, 2.5 nm from Tern Island tower.

   Plot the 0930 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 1145 your fix is 064°T, 4.8 nm from Tern Island tower. You steer 221°T at 5.8 kn through the water. At 1245 a new fix puts you 317°T, 0.9 nm from Gannet Rock daybeacon.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0920 your fix is 320°T, 2.3 nm from Tern Island tower. You steer 212°T at 4.2 kn through the water. At 1020 a new fix puts you 049°T, 1.2 nm from Heron Point Light.

   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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1015 your fix is 055°T, 2.4 nm from Heron Point Light. You steer 036°T at 4.0 kn through the water. At 1100 a new fix puts you 278°T, 2.3 nm from Tern Island tower.

   Plot the 1100 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