Worksheet 909 · Skill 5

Set and drift

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1. At 1425 your fix is 217°T, 2.0 nm from Tern Island tower. You steer 081°T at 7.8 kn through the water. At 1510 a new fix puts you 053°T, 3.6 nm from Gannet Rock daybeacon.

   Plot the 1510 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 1255 your fix is 353°T, 0.9 nm from Kittle water tank. You steer 021°T at 7.6 kn through the water. At 1325 a new fix puts you 068°T, 3.1 nm from Gannet Rock daybeacon.

   Plot the 1325 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  

3. At 0845 your fix is 070°T, 3.7 nm from Tern Island tower. You steer 149°T at 4.4 kn through the water. At 0920 a new fix puts you 069°T, 3.4 nm from Gannet Rock daybeacon.

   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 1225 your fix is 062°T, 3.4 nm from Westfield church spire. You steer 228°T at 4.6 kn through the water. At 1255 a new fix puts you 065°T, 1.3 nm from Westfield church spire.

   Plot the 1255 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  

5. At 1330 your fix is 073°T, 2.8 nm from Tern Island tower. You steer 182°T at 4.7 kn through the water. At 1420 a new fix puts you 123°T, 1.4 nm from Gannet Rock daybeacon.

   Plot the 1420 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 1350 your fix is 346°T, 1.5 nm from Gannet Rock daybeacon. You steer 241°T at 4.3 kn through the water. At 1450 a new fix puts you 030°T, 1.5 nm from Mill stack.

   Plot the 1450 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 60 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

7. At 1035 your fix is 252°T, 3.0 nm from Tern Island tower. You steer 187°T at 6.5 kn through the water. At 1105 a new fix puts you 346°T, 1.5 nm from Mill stack.

   Plot the 1105 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 1520 your fix is 014°T, 2.1 nm from Heron Point Light. You steer 040°T at 5.6 kn through the water. At 1625 a new fix puts you 321°T, 2.8 nm from Tern Island tower.

   Plot the 1625 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