Worksheet 906 · Skill 5

Set and drift

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1. At 1330 your fix is 026°T, 2.3 nm from Mill stack. You steer 335°T at 6.2 kn through the water. At 1410 a new fix puts you 287°T, 3.3 nm from Tern Island tower.

   Plot the 1410 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  

2. At 1155 your fix is 058°T, 2.1 nm from Heron Point Light. You steer 102°T at 5.3 kn through the water. At 1235 a new fix puts you 193°T, 1.6 nm from Gannet Rock daybeacon.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0800 your fix is 052°T, 3.4 nm from Heron Point Light. You steer 298°T at 6.1 kn through the water. At 0835 a new fix puts you 067°T, 0.9 nm from Westfield church spire.

   Plot the 0835 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 0700 your fix is 043°T, 1.9 nm from Heron Point Light. You steer 332°T at 5.3 kn through the water. At 0805 a new fix puts you 029°T, 3.1 nm from Westfield church spire.

   Plot the 0805 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  

5. At 1230 your fix is 345°T, 3.0 nm from Mill stack. You steer 350°T at 5.3 kn through the water. At 1310 a new fix puts you 289°T, 3.2 nm from Tern Island tower.

   Plot the 1310 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  

6. At 1045 your fix is 234°T, 2.4 nm from Tern Island tower. You steer 265°T at 5.2 kn through the water. At 1115 a new fix puts you 097°T, 2.0 nm from Westfield church spire.

   Plot the 1115 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  

7. At 0755 your fix is 033°T, 1.6 nm from Westfield church spire. You steer 149°T at 9.0 kn through the water. At 0825 a new fix puts you 073°T, 1.3 nm from Heron Point Light.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1220 your fix is 083°T, 2.2 nm from Tern Island tower. You steer 176°T at 6.7 kn through the water. At 1300 a new fix puts you 353°T, 0.9 nm from Kittle water tank.

   Plot the 1300 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