Double negatives are tricky even when they're disguised. "Nav ready" means no nav. The Nav menu button will display a working compass and a message that you could have nav if you buy the sd card and plug it in. That's the base version of 7.0.
If you mean without any evidence of the nav menu at all including not having the compass, then the answer is probably no - it doesn't come that way. Same sort of thing for satellite radio. Classicas without the sat antenna and sat receiver still have it on the menu - but it can't be selected.
sorry if it was stated confusing. based it is possible to have a 7.0 radio that is not capable of upgrading it to having NAV if it did not originally come with it.
as far as i can tell they are all not LIVE traffic update capable, seems so odd to me that they have nothing included, that is such old tech that mazda should be able to have that functional.