Upgrades from a non-ES transponder to an ES transponder will require your dealer to ship the unit back to Garmin for the upgrade.
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What our clients say...
Absolutely fantastic service. Really wanted my delivery for Christmas and the extra effort Bournemouth Avionics went to to get this to me was way beyond they level of service expected. Pricing was also the best by far. Highly recommended.
Installed a new radio and I took the opportunity to a shuffle of the radio stack to make things a bit neater. They were very friendly and helpful with the project - and completed it on time, to the price quoted and without any problems.