A few links are listed below where you can find maps of Hungary and of other parts of the world to make the planning process of a journey easier. 

http://www.maps.google.com
You can discover the whole world by Google maps.

http://www.1hungary.com/map/hungary
Are you looking for a location in Hungarian? Search on this website.

http://www.turabazis.hu
Find maps for self-guided walking tours in Hungary. (The website is in Hungarian.)

http://www.utcakereso.hu/map3/index.php?⟨=en
With the help of this website you can easily find a street in Hungary, not only in Budapest but in other main cities too.