Peter,
You could start by avoiding making posts like these:
Most of the stuff they made was junk - the worst quality avionics that ever existed for GA.
and "GNS" means only one thing in that context
MJ you haven't got a clue, sorry!
In each case, you boldly present your opinion, without substantiation.
You need to realise that there are others here, and everywhere, with more experience, expertise, and ability. A degree of moderation in your statements, and some humility, might improve your contributions significantly.
You did ask.