Worksheet 411 · Skill 5

Set and drift

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1. At 0925 your fix is 108°T, 1.5 nm from Westfield church spire. You steer 003°T at 6.6 kn through the water. At 0955 a new fix puts you 023°T, 3.8 nm from Westfield church spire.

   Plot the 0955 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  

2. At 0750 your fix is 071°T, 2.0 nm from Gannet Rock daybeacon. You steer 185°T at 5.1 kn through the water. At 0825 a new fix puts you 358°T, 1.4 nm from Kittle water tank.

   Plot the 0825 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  

3. At 1215 your fix is 041°T, 2.6 nm from Heron Point Light. You steer 026°T at 8.2 kn through the water. At 1250 a new fix puts you 332°T, 1.7 nm from Tern Island tower.

   Plot the 1250 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 1310 your fix is 028°T, 2.4 nm from Kittle water tank. You steer 354°T at 4.1 kn through the water. At 1355 a new fix puts you 075°T, 2.5 nm from Tern Island tower.

   Plot the 1355 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 1315 your fix is 166°T, 1.1 nm from Westfield church spire. You steer 069°T at 5.1 kn through the water. At 1350 a new fix puts you 065°T, 2.7 nm from Westfield church spire.

   Plot the 1350 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 1255 your fix is 168°T, 1.5 nm from Gannet Rock daybeacon. You steer 313°T at 5.0 kn through the water. At 1335 a new fix puts you 266°T, 1.5 nm from Gannet Rock daybeacon.

   Plot the 1335 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 1435 your fix is 118°T, 2.0 nm from Westfield church spire. You steer 011°T at 7.7 kn through the water. At 1505 a new fix puts you 030°T, 3.6 nm from Westfield church spire.

   Plot the 1505 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 0745 your fix is 335°T, 2.7 nm from Tern Island tower. You steer 218°T at 8.1 kn through the water. At 0825 a new fix puts you 098°T, 3.1 nm from Westfield church spire.

   Plot the 0825 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