Worksheet 778 · Skill 5

Set and drift

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1. At 1505 your fix is 044°T, 2.7 nm from Gannet Rock daybeacon. You steer 312°T at 6.7 kn through the water. At 1535 a new fix puts you 007°T, 2.6 nm from Tern Island tower.

   Plot the 1535 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  

2. At 1515 your fix is 089°T, 0.9 nm from Westfield church spire. You steer 092°T at 5.0 kn through the water. At 1600 a new fix puts you 259°T, 2.7 nm from Tern Island tower.

   Plot the 1600 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  

3. At 1555 your fix is 000°T, 2.5 nm from Mill stack. You steer 110°T at 5.9 kn through the water. At 1625 a new fix puts you 058°T, 2.0 nm from Mill stack.

   Plot the 1625 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 1400 your fix is 336°T, 1.2 nm from Kittle water tank. You steer 261°T at 5.6 kn through the water. At 1450 a new fix puts you 001°T, 2.2 nm from Mill stack.

   Plot the 1450 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  

5. At 1200 your fix is 036°T, 2.2 nm from Kittle water tank. You steer 274°T at 4.5 kn through the water. At 1230 a new fix puts you 197°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 1230 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 1150 your fix is 094°T, 1.3 nm from Westfield church spire. You steer 108°T at 4.1 kn through the water. At 1250 a new fix puts you 015°T, 2.7 nm from Mill stack.

   Plot the 1250 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 0730 your fix is 325°T, 1.5 nm from Kittle water tank. You steer 322°T at 4.9 kn through the water. At 0800 a new fix puts you 322°T, 3.1 nm from Kittle water tank.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1335 your fix is 037°T, 3.1 nm from Tern Island tower. You steer 168°T at 4.8 kn through the water. At 1450 a new fix puts you 154°T, 2.6 nm from Tern Island tower.

   Plot the 1450 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