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[aprssig] How to delete/remove an Object

Bob Bruninga bruninga at usna.edu
Thu Aug 14 01:29:45 UTC 2008


>> ... on receipt, STATIONS and OBEJCTS should be 
>> treated the same and transparently....
>> This means if Joe's KB3XXX tracker dies and 
>> leaves him at the starting point, that ANYONE 
>> can take over his symbol on their map, MOVE HIM
>> to where he should be now, and now he is an 
>> object owned by them.

> I think it would be a fundamental mistake if anyone 
> could take over a station and move or kill it. 

No, it was a fundamental principle of APRS. Operators must be able to mutually manage the APRS map.  There are all kinds of things that can happen to a "station" that can cause his data to be wrong, in the wrong place, wrong
info, bad info, inappropriate place, or info.  Since that is a permanent part of the map, then anyone should be able to take over that station to correct the local situation map.

Remember two other details:
1) If anyone takes over that "station" as an object, the new ownership is clearly attributible to that new operator, so there is no problem with loss of attribution.

2) If the original Station is still on the air, then his software remains on the air and continues to transmit his original info.  In that sense, you cannot replace him with an object.  Because of the fundamental =equivalence= of stations and objects, his retransmissoin from his "station" will always take back-over any OBJECT attempt to replace him.

But if his last transmitted STATION info that is stuck on the map from an hour, a day, a month ago is in the way, or not appropriate for the current event, then anyone should be able to update that "station" with an OBJECT that then replaces that "station" on all clients so that it can be MOVED or deleted.  That was fundamental to APRS map and situational awareness management.

>> I believe UI-View did not implement ... this [detail], 
>> which is one of the main reasons we do not see 
>> people managing "things" on the map at APRS special
>> events.

>I'm not sure what you mean by that.

I mean that I never see APRS objects used to the extent the system was designed for at APRS events.  And I attribute that to the problems in managing and transmitting and updating large numbers of objects in UIview which is the most used APRS program these days.

>In UI-View... I can't take over ownership of a 
>"station" though, just an object. I can't move
>someone else's station either.

Thanks.  Yes, I know at first blush people panic at the thought of abuse of this feature.  But it is not abused, and is a powerful fundamental principle of APRS.  And you canot take over or replace a working stationl.  The only reason I keep raising these issues is so that people do not forget what APRS is supposed to do so that when new applications are written they do not make the same mistakes as in the past.

Not complaining, just making we sure we do not forget how APRS is supposed to work...

Bob, WB4APR






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