Worksheet 931 · Skill 5

Set and drift

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1. At 1040 your fix is 107°T, 2.4 nm from Westfield church spire. You steer 101°T at 6.2 kn through the water. At 1140 a new fix puts you 301°T, 1.4 nm from Kittle water tank.

   Plot the 1140 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  

2. At 1155 your fix is 168°T, 1.1 nm from Westfield church spire. You steer 082°T at 8.9 kn through the water. At 1255 a new fix puts you 012°T, 1.2 nm from Gannet Rock daybeacon.

   Plot the 1255 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  

3. At 1545 your fix is 259°T, 2.6 nm from Tern Island tower. You steer 204°T at 8.5 kn through the water. At 1615 a new fix puts you 051°T, 1.7 nm from Heron Point Light.

   Plot the 1615 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 1145 your fix is 004°T, 3.4 nm from Westfield church spire. You steer 159°T at 4.7 kn through the water. At 1240 a new fix puts you 077°T, 2.2 nm from Westfield church spire.

   Plot the 1240 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  

5. At 0950 your fix is 057°T, 4.3 nm from Tern Island tower. You steer 164°T at 6.4 kn through the water. At 1035 a new fix puts you 076°T, 3.0 nm from Gannet Rock daybeacon.

   Plot the 1035 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 0800 your fix is 300°T, 3.4 nm from Tern Island tower. You steer 196°T at 5.3 kn through the water. At 0840 a new fix puts you 263°T, 3.5 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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1050 your fix is 009°T, 1.8 nm from Kittle water tank. You steer 341°T at 4.3 kn through the water. At 1210 a new fix puts you 054°T, 1.5 nm from Tern Island tower.

   Plot the 1210 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  

8. At 1440 your fix is 076°T, 2.8 nm from Gannet Rock daybeacon. You steer 350°T at 5.3 kn through the water. At 1520 a new fix puts you 072°T, 5.1 nm from Tern Island tower.

   Plot the 1520 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