On Jan 1, 5:17 pm, "Roy N5804F"
wrote:

Why is a new version of the software is required and what changes it will
introduce ?

I don't know what v3.0 firmware for the 480 will bring. The current 480
firmware is 2.1, so 3.0 should have some significate enhancements. I
just got this from the support guys when I was upgrading to 2.1

When did Garmin announced that they will "continue development and support
for the 480" ?
What do all the aircraft fitted with only dual 430/530's use for primary
enroute navigation under instrument rules ?

What ever they have been using. Could be VOR for example.