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Re: altitude validity
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From: |
Gary E. Miller |
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Subject: |
Re: altitude validity |
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Date: |
Tue, 4 Feb 2020 14:23:14 -0800 |
Yo Greg!
On Mon, 03 Feb 2020 19:18:35 -0500
Greg Troxel <address@hidden> wrote:
> Thanks. This is about direwolf, a software modem for amateur radio
> packet.
Oh, more ham stuff. Seems to be popular again. Maybe even a
Maindenhead user?
> So this notion of NaN makes a lot of sense, but it was unobvious from
> reading gps.h and from reading the libgps man page.
No one gets NaN the first few times. Libraries constantly get it wrong.
I have seen sevaral bug reports on major languages in the last week
about NaN misunderstanding.
> I am also unclear on that ALTITUDE_SET means, if one is supposed to
> check against NaN.
It means nothing. Note that is it undocumented. Ignore it. I would
remove it, but there is so much legacy code that all I can do is
deprecate it.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
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"If you can't measure it, you can't improve it." - Lord Kelvin
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