Worksheet 194 · Skill 5

Set and drift

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1. At 1005 your fix is 308°T, 3.4 nm from Tern Island tower. You steer 248°T at 6.8 kn through the water. At 1040 a new fix puts you 003°T, 2.5 nm from Westfield church spire.

   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  

2. At 0720 your fix is 016°T, 2.3 nm from Gannet Rock daybeacon. You steer 174°T at 5.0 kn through the water. At 0805 a new fix puts you 144°T, 2.9 nm from Gannet Rock daybeacon.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

3. At 1250 your fix is 287°T, 1.9 nm from Gannet Rock daybeacon. You steer 148°T at 5.0 kn through the water. At 1320 a new fix puts you 191°T, 1.3 nm from Gannet Rock daybeacon.

   Plot the 1320 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  

4. At 1225 your fix is 053°T, 3.4 nm from Westfield church spire. You steer 180°T at 6.2 kn through the water. At 1300 a new fix puts you 349°T, 1.2 nm from Heron Point Light.

   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 35 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 0705 your fix is 044°T, 3.4 nm from Heron Point Light. You steer 292°T at 4.0 kn through the water. At 0755 a new fix puts you 099°T, 1.3 nm from Westfield church spire.

   Plot the 0755 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  

6. At 1040 your fix is 195°T, 2.1 nm from Tern Island tower. You steer 240°T at 4.2 kn through the water. At 1125 a new fix puts you 083°T, 1.8 nm from Heron Point Light.

   Plot the 1125 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 1435 your fix is 312°T, 2.7 nm from Tern Island tower. You steer 195°T at 6.9 kn through the water. At 1520 a new fix puts you 352°T, 2.8 nm from Mill stack.

   Plot the 1520 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  

8. At 0940 your fix is 076°T, 3.4 nm from Tern Island tower. You steer 187°T at 6.2 kn through the water. At 1010 a new fix puts you 028°T, 1.6 nm from Gannet Rock daybeacon.

   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 30 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn