Deeno,
The latest version of the Argo Navis firmware is available free to all registered owners of an Argo Navis unit. I am sure if your unit is not registered for some reason, Gary Kopff can sort it out if you send him an email.
The new firmware is compatible with the new and older Argo Navis units. The new unit essentially has the same "guts" as the old unit, except the circuit board and case were redesigned to make servicing and changing the on board battery easier.
You need to check which firmware version you are running. You can do this from the Argo Navis unit itself. Power the unit on, it doesn't need to be connected to anything, just have batteries in it or power connected. Turn the detent wheel until you get "Mode Status", press "Enter". It says "power". Then turn the wheel two detent clicks clockwise. The first step is "Thermal"and the second step is "Version". If you are running version 2.*.* you are fine. If you are running 1.*.* you need to upgrade.
You go to the Wildcard website and download the appropriate software upgrade utility based on your operating system from here:-
http://www.wildcard-innovations.com.au/utilities.html
You then need to download the latest firmware from here:-
http://www.wildcard-innovations.com.au/firmware.html
Follow the user manual when you do the firmware upgrade. Importantly, record all your initial setup parameters like encoder steps and sign and the like because they will all reset with the firmware upgrade.
Once you have version 2.*.* read up on the TPAS section of the manual and you will find pointing accuracy is superb and things like having the angle between axis at 90 degrees and the base level totally superfluous.
Cheers,
John B