Mrs Oneant and I are leaving for Paris next weekend for a week. Our Garmin is a discontinued model and the Euro maps aren't available for it. We're both bringing our iPhones, but will be disabling data roaming due to ATT's ridiculous charges.

We'd like some sort of GPS while we're there, and we're looking for the best one to allow downloading of a local Paris area map for offline use (just using the GPS chip).

Obviously, this isn't free, and we're ok with that.

Preferrably, we'd like something that will allow us to add the points of interest we plan to hit, so that we could navigate to them on foot.

Any recommendations?