Guilty as charged -- negative altitude numbers are not something I have a lot of experience with. I'll take a look at it, but living at an altitude of 100+ meters ASL, it's a little difficult for me to 'simulate' without driving to the coast myself.<div>
<br></div><div>I'd recommend ignoring those numbers as well if you can.</div><div><br></div><div>I *have* noticed that when my unit powers up, it can generate some strange altitude numbers for the first packet it transmits -- any idea if this is an issue related to powerup? Or do you see multiple packets that look like this -- if you've got some more examples of malformed packets, that would certainly help.</div>
<div><br></div><div>Regards,</div><div><br></div><div>Greg Clark K7RKT</div><div>BigRedBee, LLC</div><div><br><div class="gmail_quote">On Fri, Aug 6, 2010 at 8:50 PM, Lynn W. Deffenbaugh (Mr) <span dir="ltr"><<a href="mailto:ldeffenb@homeside.to">ldeffenb@homeside.to</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">From aprs101.pdf (search for it and read a copy):<br>
<br>
Altitude in Comment Text — The comment may contain an altitude value,<br>
in the form /A=aaaaaa, where aaaaaa is the altitude in feet. For example:<br>
/A=001234. The altitude may appear anywhere in the comment.<br>
<br>
No, /A=000-17 is not a valid altitude. My client would simply ignore it, and leave it in the comment text because it looks for /A= followed by a valid 6 digit number. It does allow for a minus sign and 5 digits, but NOT for a non-number as this is. If you know it's a BigRedBee, I'd suggest contacting them to get their firmware fixed.<br>
<br>
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32<br>
<br>
PS. On the transmitting side, my client will only transmit an altitude if it is greater than 0. I know there are places on the planet where <0 is valid, but they are fewer and further between than GPSs that indicate negatives when people are driving around at or just above sea level.<br>
<br>
VK6 UFO wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
G'day, I've just joined this mailing list so apologies for questions that have already been dealt with.<br>
<br>
I'm writing a small program for local users which can monitor local traffic (via AGW PE and a receiver) and react to certain events.<br>
One thing I've noticed is that there's no spec I can find for altitude using /A=###### which accounts for values below sealevel. I first came across this when some mobile stations are reporting like this:<br>
<br>
2010-08-07 02:52:22 UTC: VK6ZMS-9>APBL10,VK6KSB-3*,WIDE2-2,qAR,VK6GHZ:!3232.15S/11544.66EP236/000/A=000-17<br>
<br>
VK6ZMS-9 is using a BigRedBee and no doubt his GPS receiver is reporting his altitude below sealevel. His location at the time was next to the coast so it could be an error from his GPS receiver or he may have actually been below sealevel... I'm not familiar with the terrain there. I've adjusted my software to allow for this format anyway.<br>
</div><a href="http://aprs.fi" target="_blank">aprs.fi</a> <<a href="http://aprs.fi" target="_blank">http://aprs.fi</a>> seems to treat reports like that as not an altitude report so it ends up in the comment text.<div class="im">
<br>
I guess my question is.. is this altitude report valid or should it be something else? Is there documentation somewhere that would clear it up?<br>
<br>
Thanks.<br>
-- <br>
———————<br>
Rob VK6UFO<br>
<br></div>
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</blockquote>
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