Worksheet 804 · Skill 5

Set and drift

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1. At 1225 your fix is 035°T, 2.8 nm from Heron Point Light. You steer 136°T at 4.0 kn through the water. At 1315 a new fix puts you 002°T, 2.4 nm from Mill stack.

   Plot the 1315 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 50 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 0725 your fix is 083°T, 2.3 nm from Heron Point Light. You steer 096°T at 5.0 kn through the water. At 0805 a new fix puts you 037°T, 2.2 nm from Mill stack.

   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 40 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 0845 your fix is 227°T, 2.9 nm from Tern Island tower. You steer 354°T at 5.6 kn through the water. At 0920 a new fix puts you 298°T, 3.3 nm from Tern Island tower.

   Plot the 0920 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 1010 your fix is 346°T, 1.8 nm from Heron Point Light. You steer 096°T at 5.7 kn through the water. At 1055 a new fix puts you 228°T, 2.5 nm from Gannet Rock daybeacon.

   Plot the 1055 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 1125 your fix is 044°T, 2.4 nm from Westfield church spire. You steer 148°T at 4.1 kn through the water. At 1250 a new fix puts you 236°T, 3.4 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 85 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

6. At 0945 your fix is 049°T, 3.2 nm from Tern Island tower. You steer 203°T at 4.9 kn through the water. At 1055 a new fix puts you 047°T, 2.4 nm from Mill stack.

   Plot the 1055 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 70 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1400 your fix is 357°T, 1.6 nm from Tern Island tower. You steer 078°T at 5.6 kn through the water. At 1430 a new fix puts you 067°T, 3.9 nm from Tern Island tower.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1355 your fix is 254°T, 2.9 nm from Gannet Rock daybeacon. You steer 287°T at 6.4 kn through the water. At 1425 a new fix puts you 034°T, 3.5 nm from Heron Point Light.

   Plot the 1425 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