Here's an idea for a perfect GA business model: set up a really good avionics shop on Losinj (LDLO) or Brac (LDSB).
Or Zadar ... get an ILS there and enough concrete to depart a Tupolev on one engine 
It would actually be OK for the Germans. They can pop down there easily, and you could offer a free fuel tank top-off and free landing fees and you would still be well below the price quoted by the well known German avionics shop - the one which recently quoted a friend of mine €1000 for a single KMD550 data cartridge.
The need to cross the Alps would also filter out the quality customers - only kidding, honestly 
Mine too.
I wonder how many installs do switch automatically. I think a very small % does.
Mine does.
From Garmin Installation manual:
"STBY Selects the standby mode. When in standby mode, the transponder does not reply to any interrogations. Pressing and holding the STBY key selects ground (GND) mode if Automated Airborne Determination is not otherwise selected from another source. When GND is annunciated, the transponder does not respond to ATCRBS interrogations but replies to All-Call interrogations."
If it has been configured correctly it should show GND and go to ALT when airborne without having to touch it.
Once I power on the radio's (by usage of a switch that powers all of them on, so not pressing the 'On' button on the GTX330), mine goes straight to STBY, and I am very sure (not 100%), that it will stay like that until I press 'ALT'. I havent seen GND or any automatic switching. Maybe it's to do with complexity of aircraft? Mine is in a PA28, with a GNS430, however the 2 are not linked, so I dont know if that has a bearing on the config.
Only much later it was done, with a differential air pressure switch as described here. That works fine.
I have a pitot air pressure switch and it works great. It only cost me 100 € including install, one of the best investments I've made. Priceless when you takeoff into IMC with high workload and really don't want to put attention to why ATC cannot identify you.
If it has been configured correctly it should show GND and go to ALT when airborne without having to touch it.
I wonder how many installs do switch automatically. I think a very small % does.
When I got the GTX330 installed in 2005, the installer wired it to the KLN94 for auto GS based switching. That is on page 74 in the IM. It never worked and both Garmin and Honeywell washed their hands of it. I paid a few hundred quid extra for that, but it was abandoned.
Only much later it was done, with a differential air pressure switch as described here. That works fine.
If it has been configured correctly it should show GND and go to ALT when airborne without having to touch it.
On the GTX330, press "On" to select mode A and mode S. Press "ALT" to select mode A, C, and S
Would I be right in thinking then it sounds like it was switched on, but left in Standby? AFAIK (besides being powered on or off), the 2 operating modes are STBY and ALT.
Hmmm - really interesting...
He said he will check it against the next radar service, so I guess he will get to the bottom of it.
It was a fairly close miss.
I am not so keen on Mode A only targets especially when in IMC and one of them is right at my position, like today... I asked ATC to fly the IAP at 4000ft (just above the cloud) instead of the 3200ft platform, due to the TCAS return.
