The CDI tells you which heading to turn to if you dial
in the correct OBS. Which do you think is more useful
command: turn left, or turn to a heading of xxx?

If I'm already pointing more or less in the right direction,
"turn left" is more useful. If not, the actual heading is.

I guess it really comes down to... the needle can be read as saying
"turn left... of the course in the OBS". Which if you're pretty much
facing the course in the OBS, is "left". And if not, you get your
heading by looking left of the OBS.

Jose
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