Incorporation Map inside the MATLAB for calculating longitude/latitude

Basically, there will be three towers and collecting information from those towers I want to calculate their distances from the receiver for tracking purposes (just like Satellite or eLoran). Therefore, I am trying to incorporate the map of a country inside the MATLAB so that after I get the values I will calculate the latitude and longitude and indicate the position of the object within the map which will be shown on a monitor. Now, how can I incorporate the map in the MATLAB?