Worksheet 247 · Skill 5

Set and drift

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1. At 1305 your fix is 321°T, 1.9 nm from Tern Island tower. You steer 272°T at 6.5 kn through the water. At 1340 a new fix puts you 052°T, 3.5 nm from Westfield church spire.

   Plot the 1340 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  

2. At 1445 your fix is 332°T, 2.4 nm from Mill stack. You steer 039°T at 6.4 kn through the water. At 1515 a new fix puts you 203°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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1535 your fix is 263°T, 3.3 nm from Tern Island tower. You steer 328°T at 4.4 kn through the water. At 1605 a new fix puts you 056°T, 3.9 nm from Westfield church spire.

   Plot the 1605 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 0725 your fix is 249°T, 3.4 nm from Tern Island tower. You steer 327°T at 4.0 kn through the water. At 0755 a new fix puts you 046°T, 3.7 nm from Westfield church spire.

   Plot the 0755 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  

5. At 1045 your fix is 270°T, 1.6 nm from Gannet Rock daybeacon. You steer 029°T at 7.0 kn through the water. At 1125 a new fix puts you 072°T, 2.4 nm from Tern Island tower.

   Plot the 1125 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 1500 your fix is 238°T, 2.6 nm from Gannet Rock daybeacon. You steer 290°T at 4.9 kn through the water. At 1555 a new fix puts you 096°T, 2.4 nm from Westfield church spire.

   Plot the 1555 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  

7. At 0850 your fix is 004°T, 1.7 nm from Mill stack. You steer 071°T at 6.7 kn through the water. At 0920 a new fix puts you 161°T, 1.2 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1245 your fix is 020°T, 3.8 nm from Westfield church spire. You steer 174°T at 4.1 kn through the water. At 1410 a new fix puts you 352°T, 2.6 nm from Mill stack.

   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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn