Ian Bennett ibennett at tpg.com.au
Tue Nov 25 12:06:49 EST 2008

	I had read this however I was seeking some additional guidance. Probably best 
if I work a scenario.
	I have VK1IB-9 entered into my VHF tracker and VK1IB-15 in my HF one. I start 
on my trip.
	Those watching my progress will see two separate icons in the same place. 
Ugly, but no problem for the moment.
	As I progress, I eventually get out of range of any VHF repeaters. VK1IB-9 
stops. HF is still operational so VK1IB-15 continues to move. Now anyone 
watching my progress sees two icons in different locations. This outcome is 
not what I am looking for.
	I want people tracking my progress to see one icon only, updated with 
position reports from the "best" source.
	From what I am reading, I should be leaving my VHF APRS gear at home right??


On Tue, 25 Nov 2008 11:48:39 Phillip wrote:
> Hi Ian
>               Congratulations and welcome to Amatuer radio
> To answer your questions there are standard SSIDs for most applications
> attached is the standard SSID recommendations
> 73 Phillip
> Since there are many APRS users on the air, the APRS maps and data can
> get very cluttered.  Also, most operators have multiple stations on the
> air, such as their HOME, CAR, BOAT, and HT.  It is very convenient to be
> able to recognize these typical applications at a glance.
>   Here are those common defaults:
> -0 Home Station, Home Station running IGate.
> -1 Digipeater, Home Station running a Relay Digi, Wx Digipeater
> -2 Digipeater [#2 or] on 70CM
> -3 Digipeater [#3]
> -4 HF to VHF Gateway
> -5 IGate (Not home station)
> -6 is for Operations via Satellite
> -7 Kenwood D7 HH
> -8 is for boats, sailboats and ships (maybe 802.11 in the future)
> -9 is for Mobiles
> -10 is for operation via The internet only
> -11 is for APRStouch-tone users  (and the occasional Balloons)
> -12 Portable Units such as Laptops, Camp Sites etc.
> -13 Un-asigned
> -14 is for Truckers
> -15 is for HF
> Originally, in 1992, the first APRS GPS mobiles just transmitted raw
> NMEA-0183 GPS stings and so there was no way to insert a SYMBOL byte in
> the pre-formatted NMEA 183 packet.  Hence we defined 14 common SYMBOLs as
> defaults to the 14 available SSID's that a mobile could use.  These
> included BIKES, HELICOPTERS, AIRCRAFT, VANS and many others in addition
> to the ones above.  This is now OBSOLETE.
> In the late 1990's we came up with a better solution and defined the
> AX.25 TOCALL of GPSxyz for such use.  In this case, the "xyz" characters
> can be used to define any of the hundreds of APRS symbols including
> Overlays.   Just look up the xyz in the SYMBOLS.TXT file included in all
> copies of APRSdos (or these days, on the WEB).
> Since this GPSxyz concept was so powerful, it completely replaced the
> original SSID assignments and so those original NMEA defaults have been
> removed from the Documentation.
> However the convention for the 6 most useful ones remains and should be
> used in the absesnce of any other overriding conditions.  Except for the
> TH-D7 and Truckers, the other SSID conventions mark APRS "TYPES" of users
> that are independent of the many SYMBOLS they can use.  Thus it is nice
> to know HOW someone is getting into the system, whether via satellite,
> HF, the internet, or touchtone.  For example, using the -6 only for Space
> applications is so that the global APRS WEB data bases will keep
> statistics and data for when you are operating through the satellites
> separate from when you are working normally.
> So stick to the standards above for the obvious applications...  Of course
> these are not rigid.  If you have more than 4 digipeaters, use any SSID
> you want.
> These are only guidelines...
> de WB4APR, Bob

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