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How to add default GPS units to custom addon aircraft?

In a lot of addons I see default GPS units installed, I am making a custom addon aircraft and I would like to know how to implement these standard g1000s or other such units.
Importing the 'touch' devices is the best place to start, because you can get up and running without the complex interaction of model XML knobs and buttons.

by far the simplest is the Aera GPS e.g. with panel.cfg:
size_mm = 1280,800
pixel_size = 1280,800
texture = SCREEN_GPS
htmlgauge00 = NavSystems/Aera/Aera.html, 0,0,1280,800

A panel instrument without too complex knobs/buttons is the stock AS3X_Touch. Great example in the freeware Gotgravel Vertigo - you need to look at the panel.cfg and the model XML:

Outside the use of Asobo templates, the model XML panel events have been decoded here:
Don't forget, if using the Aera you will need to have a panel.xml file as well to link the electricity in the gauge to the appropriate circuit (and add the circuit for the GPS into the [ELECTRICAL] section of systems.cfg

Panel.xml in panel folder:
            <Simvar name="CIRCUIT ON:15" unit="Boolean"/>


In systems.cfg [ELECTRICAL]

circuit.15 = Type:CIRCUIT_XML #Connections:bus.2# Power:10, 15, 11.5# Name:Aera_Tablet