In article m, "Richard
Kaplan" writes:

As I said, the 530 is easier to use but does not contain any functionality
that the 430 does not, i.e. there is no approach or other IFR function the
530 does that the 430 cannot do.

Only difference I know (besides bigger which is good for old eyes) is the 530
gives distance and vector to a selected VOR. The 430 will do this if you
select the VOR as a waypoint but the 530 will do it from the NAV select.

Chuck