Worksheet 119 · Skill 5

Set and drift

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1. At 1130 your fix is 340°T, 1.1 nm from Gannet Rock daybeacon. You steer 067°T at 5.8 kn through the water. At 1205 a new fix puts you 030°T, 3.4 nm from Gannet Rock daybeacon.

   Plot the 1205 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 0940 your fix is 000°T, 2.0 nm from Tern Island tower. You steer 252°T at 8.1 kn through the water. At 1010 a new fix puts you 276°T, 3.8 nm from Tern Island tower.

   Plot the 1010 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 1320 your fix is 027°T, 2.6 nm from Tern Island tower. You steer 260°T at 7.5 kn through the water. At 1420 a new fix puts you 028°T, 3.4 nm from Westfield church spire.

   Plot the 1420 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  

4. At 1245 your fix is 262°T, 3.0 nm from Gannet Rock daybeacon. You steer 337°T at 8.9 kn through the water. At 1315 a new fix puts you 295°T, 4.0 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0825 your fix is 080°T, 2.8 nm from Gannet Rock daybeacon. You steer 278°T at 5.1 kn through the water. At 0930 a new fix puts you 082°T, 1.4 nm from Tern Island tower.

   Plot the 0930 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 0715 your fix is 098°T, 1.0 nm from Gannet Rock daybeacon. You steer 003°T at 6.9 kn through the water. At 0800 a new fix puts you 030°T, 2.8 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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1340 your fix is 330°T, 2.8 nm from Kittle water tank. You steer 286°T at 5.6 kn through the water. At 1450 a new fix puts you 115°T, 2.1 nm from Westfield church spire.

   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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1450 your fix is 136°T, 1.6 nm from Gannet Rock daybeacon. You steer 012°T at 5.4 kn through the water. At 1545 a new fix puts you 045°T, 4.3 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn