Worksheet 180 · Skill 5

Set and drift

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1. At 1250 your fix is 080°T, 2.8 nm from Tern Island tower. You steer 145°T at 6.5 kn through the water. At 1325 a new fix puts you 048°T, 2.2 nm from Kittle water tank.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1020 your fix is 226°T, 2.2 nm from Tern Island tower. You steer 332°T at 6.4 kn through the water. At 1055 a new fix puts you 294°T, 3.1 nm from Tern Island tower.

   Plot the 1055 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 1340 your fix is 031°T, 4.1 nm from Westfield church spire. You steer 088°T at 7.5 kn through the water. At 1410 a new fix puts you 349°T, 2.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

4. At 1330 your fix is 068°T, 1.1 nm from Gannet Rock daybeacon. You steer 335°T at 5.6 kn through the water. At 1400 a new fix puts you 085°T, 1.7 nm from Tern Island tower.

   Plot the 1400 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 0825 your fix is 197°T, 1.9 nm from Gannet Rock daybeacon. You steer 050°T at 5.6 kn through the water. At 0910 a new fix puts you 049°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0910 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 0735 your fix is 297°T, 3.3 nm from Tern Island tower. You steer 235°T at 6.4 kn through the water. At 0805 a new fix puts you 063°T, 2.7 nm from Westfield church spire.

   Plot the 0805 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 0700 your fix is 054°T, 2.5 nm from Tern Island tower. You steer 169°T at 7.1 kn through the water. At 0735 a new fix puts you 156°T, 1.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0800 your fix is 234°T, 1.8 nm from Gannet Rock daybeacon. You steer 310°T at 7.7 kn through the water. At 0835 a new fix puts you 265°T, 3.1 nm from Tern Island tower.

   Plot the 0835 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