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Greg R. wrote:
> I've never figured out why 229 is LHA-based (instead of being
> latitude-based as 249 is). Since you're going to use the same assumed
> latitudes for a fix (or I guess maybe nearby latitudes, if a lot of
> time passes between fixes) why should you have to flip to a different
> page in the tables for each fix?
>
> Might have something to do with the computer program used to generate
> the tables, but I'd also assume that the output could be setup in
> whatever format was desired by the end-user.
Greg:

Look at the prefatory material in 229.  The tables were developed half a
century ago using IBM 1401 computers!  (There's one under restoration in
the Computer History Museum down the road from me in Silicon Valley).
1401s have way less compute power (and memory) than your cell phone.  So
I suspect very strongly the arrangement of data was based more on the
needs of the computational algorithms used to compute the tables than
for convenience of the navigator.

Lu Abel

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