The updated data card will work in either box but you need to purchase 2
updates. Both data cards must be the same cycle for the boxes to work.
Jeppesen does give you a bit of a break for the multi unit updates. Don

"Dico" wrote in message
oups.com...
Hello...

If you have a 530 or 430, does it accept the same updates? Or are the
updates specific to each machine. Also, if you have both in your
plane (one of each), do you have to purchase 2 updates?

I notice that some 530s come with 'terrain'... is this an option from
garmin? Can it be added later or do you have to upgrade the whole
unit?

Lastly, when waas becomes available... is it a simple software upgrade?
and any word on the charge of this upgrade?

Thanks,

-dr