Worksheet 344 · Skill 5

Set and drift

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1. At 1450 your fix is 057°T, 2.1 nm from Tern Island tower. You steer 277°T at 8.2 kn through the water. At 1535 a new fix puts you 289°T, 3.3 nm from Tern Island tower.

   Plot the 1535 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  

2. At 1550 your fix is 051°T, 2.5 nm from Westfield church spire. You steer 167°T at 4.6 kn through the water. At 1630 a new fix puts you 015°T, 1.8 nm from Heron Point Light.

   Plot the 1630 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  

3. At 1355 your fix is 297°T, 2.4 nm from Tern Island tower. You steer 298°T at 4.6 kn through the water. At 1430 a new fix puts you 044°T, 4.2 nm from Westfield church spire.

   Plot the 1430 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 1150 your fix is 254°T, 2.5 nm from Gannet Rock daybeacon. You steer 313°T at 4.0 kn through the water. At 1235 a new fix puts you 256°T, 3.7 nm from Tern Island tower.

   Plot the 1235 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  

5. At 1020 your fix is 197°T, 1.4 nm from Tern Island tower. You steer 091°T at 7.3 kn through the water. At 1050 a new fix puts you 064°T, 2.8 nm from Gannet Rock daybeacon.

   Plot the 1050 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  

6. At 0955 your fix is 215°T, 2.7 nm from Tern Island tower. You steer 301°T at 5.3 kn through the water. At 1100 a new fix puts you 010°T, 1.3 nm from Westfield church spire.

   Plot the 1100 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 1520 your fix is 139°T, 1.5 nm from Gannet Rock daybeacon. You steer 293°T at 8.1 kn through the water. At 1550 a new fix puts you 195°T, 1.8 nm from Tern Island tower.

   Plot the 1550 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  

8. At 0930 your fix is 010°T, 1.6 nm from Tern Island tower. You steer 241°T at 6.3 kn through the water. At 1010 a new fix puts you 082°T, 3.6 nm from Westfield church spire.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn