Worksheet 7 · Skill 5

Set and drift

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1. At 1340 your fix is 046°T, 2.1 nm from Tern Island tower. You steer 273°T at 4.7 kn through the water. At 1425 a new fix puts you 298°T, 3.2 nm from Tern Island tower.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

2. At 1130 your fix is 030°T, 2.0 nm from Tern Island tower. You steer 163°T at 4.8 kn through the water. At 1230 a new fix puts you 089°T, 0.9 nm from Gannet Rock daybeacon.

   Plot the 1230 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  

3. At 0825 your fix is 188°T, 2.1 nm from Tern Island tower. You steer 276°T at 7.0 kn through the water. At 0905 a new fix puts you 069°T, 3.0 nm from Westfield church spire.

   Plot the 0905 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  

4. At 1205 your fix is 012°T, 2.0 nm from Mill stack. You steer 094°T at 8.5 kn through the water. At 1250 a new fix puts you 044°T, 2.3 nm from Kittle water tank.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

5. At 1145 your fix is 025°T, 1.7 nm from Tern Island tower. You steer 258°T at 6.0 kn through the water. At 1245 a new fix puts you 062°T, 1.2 nm from Westfield church spire.

   Plot the 1245 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  

6. At 1410 your fix is 039°T, 3.1 nm from Westfield church spire. You steer 173°T at 8.0 kn through the water. At 1445 a new fix puts you 021°T, 1.6 nm from Heron Point Light.

   Plot the 1445 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  

7. At 1205 your fix is 300°T, 4.3 nm from Tern Island tower. You steer 167°T at 8.7 kn through the water. At 1250 a new fix puts you 008°T, 2.9 nm from Mill stack.

   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 45 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn  

8. At 1155 your fix is 255°T, 1.6 nm from Tern Island tower. You steer 248°T at 4.8 kn through the water. At 1250 a new fix puts you 108°T, 1.5 nm from Westfield church spire.

   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 55 minutes).

   Tolerance: 4° and 0.15 kn.

   Set: ________ °T   Drift: ________ kn