Re: [aprsisce] Re: Position Ambiguity
- James Ewen wrote:
> On Sat, Jan 1, 2011 at 2:30 PM, Jordan Hayes KG6UAE <kg6uae@...> wrote:I believe he was referring to my comment that the GridSquares known to
>> Since APRS doesn't know from grid-square,
> That is incorrect... there are a number of cases where APRS packets
> can include Maidenhead grid square information.
WinLink were not being used in the APRS-IS packets transmitting the
ambiguous location of the same station.
And, IIRC, there's only one non-deprecated use of GridSquares as a
location in APRS. Correction 2. From page 25 (35) of aprs101.pdf.
An alternative method of expressing a station’s location is to provide a
Maidenhead locator (grid square). There are four ways of doing this:
• In a Status Report — e.g. IO91SX/- (/- represents the symbol for a
• In Mic-E Status Text — e.g. IO91SX/G (/G indicates a “grid square”).
• In the Destination Address — e.g. IO91SX. (obsolete).
• In AX.25 beacon text, with the [ APRS Data Type Identifier — e.g.
Grid squares may be in 6-character form (as above) or in the shortened
4-character form (e.g. IO91).
I actually raised this question a while back in the aprssig and was
told, again IIRC, that no popular APRS clients or sites actually
interpret and map stations using grid squares, which is a good reason
for WinLink to not use these formats. We were looking for a way to
shorten position packets from APRS Messenger on 30m HF.
Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32