Site survey software

According my post about site survey in older post in this blog, i'd like continue write about software which use in wireless site survey. May be if we try to find in search engine we can find alot this about this.
First we can use GPS
with that hardware witch use for mark point site we survey, with gps we have coordinat, elevasi. Guys we can find screen shot about software that use for importing data from our GPS that call mapsource.

Map source or Mapsource Trip and Waypoint Manager is a Mapsource brand product. It is an economic tool for transferring data between a Garmin GPS and a computer. It has similar detail to Worldmap (without navigation aids), but does not load maps to the GPS.
if we buy the original garmin stuff like GPS actualy we have cd contain mapsource, nroute. in that cd we can find the manual to use GPS and related software.
Why mapsource very usefull for wireless site survey? couse if we ex make conection with 2 site we must know distence betwen site.
after we have data we can input to related software that can calculate wireless link in another post i will continue about link budget knowlage..
we can download manualy for garmin.com to know more about mapsource.