...
- left click (mouse) - will snap to the closest point on any line.
- c - crossing lines - will insert a new point between two lines, or a line and the 60NM circle.
d - delete - will delete the last digitized point.
l - connect to line - will insert a new point on the line at the cursor position.
- s - select line piece - will select all the points on a line until next crossing line or to end of line.
m - multiple selection - will select all points from previous point to picked point (mouse cursor location)
For the first exercise we have included a screen shot of the steps in the exercise.
...