Worksheet 418 · Skill 5

Set and drift

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1. At 0905 your fix is 024°T, 3.1 nm from Westfield church spire. You steer 132°T at 8.4 kn through the water. At 0940 a new fix puts you 037°T, 3.1 nm from Heron Point Light.

   Plot the 0940 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 1045 your fix is 047°T, 3.5 nm from Tern Island tower. You steer 201°T at 6.1 kn through the water. At 1140 a new fix puts you 232°T, 2.1 nm from Gannet Rock daybeacon.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1005 your fix is 071°T, 3.7 nm from Tern Island tower. You steer 190°T at 8.2 kn through the water. At 1040 a new fix puts you 003°T, 1.9 nm from Kittle water tank.

   Plot the 1040 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 1405 your fix is 086°T, 3.5 nm from Westfield church spire. You steer 167°T at 4.4 kn through the water. At 1435 a new fix puts you 056°T, 3.1 nm from Heron Point Light.

   Plot the 1435 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 1205 your fix is 248°T, 2.3 nm from Tern Island tower. You steer 137°T at 6.7 kn through the water. At 1240 a new fix puts you 248°T, 1.4 nm from Gannet Rock daybeacon.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 1025 your fix is 329°T, 2.1 nm from Tern Island tower. You steer 216°T at 6.0 kn through the water. At 1110 a new fix puts you 039°T, 2.7 nm from Heron Point Light.

   Plot the 1110 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 1155 your fix is 066°T, 1.9 nm from Gannet Rock daybeacon. You steer 029°T at 4.8 kn through the water. At 1230 a new fix puts you 039°T, 5.1 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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 0940 your fix is 136°T, 1.4 nm from Westfield church spire. You steer 084°T at 7.9 kn through the water. At 1020 a new fix puts you 205°T, 1.8 nm from Tern Island tower.

   Plot the 1020 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