Worksheet 55 · Skill 5

Set and drift

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1. At 0735 your fix is 061°T, 2.9 nm from Gannet Rock daybeacon. You steer 310°T at 4.2 kn through the water. At 0840 a new fix puts you 021°T, 2.5 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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1235 your fix is 278°T, 3.0 nm from Tern Island tower. You steer 160°T at 6.0 kn through the water. At 1315 a new fix puts you 357°T, 2.8 nm from Mill stack.

   Plot the 1315 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  

3. At 1030 your fix is 051°T, 2.9 nm from Westfield church spire. You steer 143°T at 5.2 kn through the water. At 1150 a new fix puts you 297°T, 1.4 nm from Kittle water tank.

   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 80 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1300 your fix is 097°T, 2.0 nm from Gannet Rock daybeacon. You steer 340°T at 5.7 kn through the water. At 1345 a new fix puts you 066°T, 3.6 nm from Tern Island tower.

   Plot the 1345 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  

5. At 1130 your fix is 291°T, 1.9 nm from Tern Island tower. You steer 256°T at 5.3 kn through the water. At 1200 a new fix puts you 059°T, 3.5 nm from Westfield church spire.

   Plot the 1200 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  

6. At 1255 your fix is 350°T, 1.4 nm from Gannet Rock daybeacon. You steer 034°T at 8.6 kn through the water. At 1325 a new fix puts you 059°T, 3.5 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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1110 your fix is 048°T, 3.9 nm from Westfield church spire. You steer 180°T at 4.2 kn through the water. At 1155 a new fix puts you 095°T, 2.5 nm from Westfield church spire.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1505 your fix is 135°T, 1.6 nm from Westfield church spire. You steer 060°T at 5.0 kn through the water. At 1545 a new fix puts you 248°T, 2.9 nm from Tern Island tower.

   Plot the 1545 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