"Mike Adams" wrote in message ...
(Paul Tomblin) wrote:

We recently put a 530 in one of our planes. Garmin says the upgrade to
WAAS is only going to be $1500. Sure, that's what they charge for the
guts, but what is this likely to run to once the shop starts adding their
labour costs, etc. Is another field approval needed, or what sort of
paper work?

Paul,

I saw a discussion about this on another forum. Other issues are that the antenna may need to be
replaced, as well as possibly the antenna cable to RG-400. The upgrade is covered by an STC with an
approved model list, so good chance no field approval will be required, but a 337 will be required for the
STC installation.

Mike

Antenna replaced? If it's broken, maybe.
Nothing in the upgrade itself would require that.
And if the cable works OK before the upgrade, it'll work OK afterward.