It is an invasion of privacy in most jurisdictions and can be illegal without a warrant.
The most accurate map is the best map.
Of course you should take a map of Philadelphia with you. It does not have to be in the traditional paper format though, you can find several maps to download to a cellphone or iPad.
It is a 2 dimensional map
Mercator.
To keep track of where you went
You can view an accurate map of Cleveland on sites such as Busted Maps, City Search, government websites NCDOT and USGS, Map Quest, and even Google Maps.
The Globe
The globe
Type those words into Google.
No
Why not download a map to your cellphone or iPad? This will be far more convenient than carrying a traditional paper copy and may even be able to link up with a GPS.
the sailing around the world map