Worksheet 18 · Skill 5

Set and drift

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1. At 0820 your fix is 061°T, 3.7 nm from Westfield church spire. You steer 148°T at 4.9 kn through the water. At 0925 a new fix puts you 225°T, 2.2 nm from Gannet Rock daybeacon.

   Plot the 0925 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 0750 your fix is 211°T, 1.0 nm from Gannet Rock daybeacon. You steer 088°T at 4.1 kn through the water. At 0835 a new fix puts you 098°T, 2.4 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0710 your fix is 318°T, 3.3 nm from Tern Island tower. You steer 264°T at 4.7 kn through the water. At 0745 a new fix puts you 031°T, 3.8 nm from Westfield church spire.

   Plot the 0745 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  

4. At 0730 your fix is 046°T, 3.1 nm from Tern Island tower. You steer 102°T at 4.7 kn through the water. At 0800 a new fix puts you 063°T, 4.5 nm from Tern Island tower.

   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  

5. At 0710 your fix is 051°T, 3.1 nm from Heron Point Light. You steer 125°T at 4.1 kn through the water. At 0815 a new fix puts you 206°T, 1.7 nm from Gannet Rock daybeacon.

   Plot the 0815 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  

6. At 0700 your fix is 029°T, 3.7 nm from Westfield church spire. You steer 137°T at 8.3 kn through the water. At 0805 a new fix puts you 236°T, 2.3 nm from Gannet Rock daybeacon.

   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 65 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 0705 your fix is 065°T, 2.8 nm from Heron Point Light. You steer 089°T at 8.6 kn through the water. At 0755 a new fix puts you 034°T, 1.9 nm from Kittle water tank.

   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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1225 your fix is 354°T, 2.6 nm from Mill stack. You steer 115°T at 5.2 kn through the water. At 1300 a new fix puts you 233°T, 1.8 nm from Gannet Rock daybeacon.

   Plot the 1300 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