Worksheet 620 · Skill 5

Set and drift

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1. At 1335 your fix is 029°T, 1.3 nm from Gannet Rock daybeacon. You steer 267°T at 5.3 kn through the water. At 1420 a new fix puts you 280°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1420 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  

2. At 1310 your fix is 109°T, 1.7 nm from Westfield church spire. You steer 093°T at 6.1 kn through the water. At 1410 a new fix puts you 238°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1410 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  

3. At 0755 your fix is 041°T, 2.3 nm from Mill stack. You steer 338°T at 7.3 kn through the water. At 0840 a new fix puts you 281°T, 1.5 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 0845 your fix is 275°T, 3.3 nm from Tern Island tower. You steer 293°T at 6.7 kn through the water. At 0920 a new fix puts you 028°T, 3.8 nm from Westfield church spire.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0735 your fix is 314°T, 2.7 nm from Tern Island tower. You steer 184°T at 7.3 kn through the water. At 0820 a new fix puts you 339°T, 2.7 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1155 your fix is 049°T, 3.7 nm from Tern Island tower. You steer 265°T at 8.3 kn through the water. At 1245 a new fix puts you 039°T, 4.2 nm from Westfield church spire.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1440 your fix is 067°T, 1.4 nm from Westfield church spire. You steer 055°T at 7.2 kn through the water. At 1515 a new fix puts you 314°T, 2.3 nm from Tern Island tower.

   Plot the 1515 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 0715 your fix is 151°T, 1.9 nm from Westfield church spire. You steer 112°T at 4.1 kn through the water. At 0800 a new fix puts you 310°T, 1.6 nm from Mill stack.

   Plot the 0800 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