They also provide a lot of EFIS (Electric Flight Information System, or "Glass Cockpit") for small GA aircraft. I think AeroDyne and Honeywell are also in this market but I mainly see Garmin there. Like the G1000 (higher models are available on business jets I think).
It's pretty good too, you get a lot of features that were limited to airliners in the past. Like seeing terrain contours around you. Not that I fly IFR (instrument without visibility conditions) but still. I think it's very impressive.