Garmin now offers the new GTN Series of units, most popular being the GTN650 and GTN750. If you currently have a Non-WAAS GNS unit and would like to obtain WAAS thru purchase of new equipment, the above text and procedures related to antenna change and annunciator requires are applicable to the process. In addition, given the differences in devices, these units are not tray and connector compatible therefore additional work is required. Consult your Garmin Dealer for details.
As another option, Avidyne has a full line of GPS/Nav/Com's called their IFD series. These units are generally considered to be "plug and play" for most features. These units are advertised as "Slide-In replacements" for existing GNS WAAS Units. For those non-WAAS unit installations, the above text and procedures related to antenna change and annunciator requirements are applicable to the process. Again, consult your Avidyne Dealer for details.
Honeywell also offers the KSN770 GPS/Nav/Com. This system requires a new installation regardless of starting point in the process.
The bottom line regarding the "Non-Basic" upgrade is that exact costs must be determined on a case-by-case basis. Your Garmin, Avidyne, and Honeywell Dealer can help you with this given enough details regarding your installation.
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