I'm a bit clueless in regards to GPS systems and have a question.

I've been doing quite a bit of traveling lately, mainly getting around on foot in cities such as Boston and Philadelphia, taking in the sites. Sometimes I just wander and think it would be pretty bad ass to have a GPS system I could use in place of a map.

Anybody here ever do such a thing? If so, which model or type would you recommend for this? How has your city-walking experiences benefited from your GPS?


Thanks for any help