Is there a way to accurately place an object on a map??

While building a basic AR app where a map will be used to lead the user to various targets in an area, I'm having difficulty accurately placing the objects within the map and I know it is due to the coordinates being pulled in as floats and these floats are rounding, causing the huge inaccuracy. For instance, when placing a model of the building that holds one of the targets at the coordinates given in google maps and using the Google GoMap asset, the building shows up several blocks from where it should be after the rounding takes place. Any suggestions would be greatly appreciated and I'm fairly new with C#(although I'm really old!!!) Thanks