Mapsource is going to have what people paid to have on there. Having used a Garmin 630csx mapping GPS in the greater NOVA area for the last 6 months, some things show up in national Parks/Historic sights and some don't. I haven't messed with the unlock thing, because the best I can determine is that it provides fishing holes. I agree with you, the Garmin site is not the most user friendly. I do not think it how your brain processes information, I think it is that Garmin's site is vague and not updated very well beyond their hardware side.