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[aprssig] Balloon DFing on APRS

Gregory A. Carter gcarter at openaprs.net
Thu Mar 8 02:34:54 UTC 2012

Correct me if I have read the spec wrong on DF but it seems the best
way to implement this on a map is perhaps a compass with a line drawn
in the direction given by BRG and ending after R (in NRQ) miles in
that direction.  Quality and number (hits) are best given textually in
an info window or perhaps in the case of Quality displayed with
differing colored lines for differing qualities.

If this sounds correct I'll try and get it up on OpenAPRS in the next
couple of days.


On Mon, Mar 5, 2012 at 8:28 AM, Lynn W. Deffenbaugh (Mr)
<ldeffenb at homeside.to> wrote:
> I believe Bob is planning to use the original directional DF, not the
> omni-DFS for his balloon tracking.  Does OpenAPRS parse the original as
> well?  If so, I'd like to run a few test objects to see what they look like
> prior to the actual reports coming in.
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
> On 3/5/2012 11:24 AM, Gregory A. Carter wrote:
>> I reviewed the code, DFS is available in the database but not rendered
>> on the frontend.  I can probably fix that in a few days if it would
>> help.
>> Greg
>> On Sun, Mar 4, 2012 at 9:30 PM, Gregory Carter<omnidynmc at gmail.com>
>>  wrote:
>>> OpenAPRS does actually parse DFS and I believe will render.  I will have
>>> to test it out, it has been a while since I wrote that code.
>>> Greg
>>> Sent from my iPhone
>>> On Mar 2, 2012, at 5:22 AM, "Bob Bruninga"<bruninga at usna.edu>  wrote:
>>>>> aprs.fi currently does not support DF in any way.
>>>> OOps.  Does anyone else know any other on-line sites that do?
>>>> Thanks
>>>> Bob, Wb4APR
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