Garmin GTS 800 Traffic system

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G1000 aircraft

You can install most current traffic systems with a G1000 - Honeywell KTA870, Avidyne TAS600, L-3 Skywatch etc. Approval on an EU aircraft is via a minor change and an AFM supplement approved under an EASA Form 36. The minor change cost will depend on whether the avionic shop already has some prior similar approvals, but if generated from scratch, could cost £900-1200. The Form 36 approval for the AFM supplement costs about €260.
The Avidyne TAS system already has an approval on all Part 23 single-engined aircraft via a German LBA-validation of an FAA STC, so no additional design and certification fees are applicable.

If IO-540- talks to the avionic shop who worked on his autopilot last year, he may be surprised to hear that a TAS system can be installed for under £12K where an FAA AML STC exists, and that a G500 definitely does not cost £45k!