Worksheet 159 · Skill 5

Set and drift

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1. At 1030 your fix is 051°T, 1.5 nm from Heron Point Light. You steer 018°T at 4.0 kn through the water. At 1110 a new fix puts you 260°T, 2.6 nm from Tern Island tower.

   Plot the 1110 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 1025 your fix is 009°T, 2.6 nm from Mill stack. You steer 056°T at 4.9 kn through the water. At 1100 a new fix puts you 209°T, 0.9 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0705 your fix is 315°T, 1.8 nm from Tern Island tower. You steer 239°T at 7.6 kn through the water. At 0735 a new fix puts you 100°T, 1.8 nm from Westfield church spire.

   Plot the 0735 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 1035 your fix is 221°T, 2.7 nm from Tern Island tower. You steer 084°T at 5.2 kn through the water. At 1150 a new fix puts you 112°T, 1.8 nm from Tern Island tower.

   Plot the 1150 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 1245 your fix is 296°T, 4.0 nm from Tern Island tower. You steer 076°T at 4.0 kn through the water. At 1325 a new fix puts you 328°T, 2.0 nm from Tern Island tower.

   Plot the 1325 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  

6. At 0810 your fix is 069°T, 3.3 nm from Tern Island tower. You steer 222°T at 8.4 kn through the water. At 0840 a new fix puts you 267°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 0840 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 1215 your fix is 272°T, 2.4 nm from Gannet Rock daybeacon. You steer 236°T at 4.7 kn through the water. At 1255 a new fix puts you 350°T, 1.8 nm from Mill stack.

   Plot the 1255 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  

8. At 0830 your fix is 009°T, 2.9 nm from Mill stack. You steer 044°T at 5.1 kn through the water. At 0920 a new fix puts you 355°T, 1.6 nm from Gannet Rock daybeacon.

   Plot the 0920 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