how u can draw cotour map by using gps or map source [center]by using GPS
u can entre the 4 point of 4 corners by lat & long
and after that enter the point by same (fixed)interval between them.
so now we have a net of points
then take the coordinates and elevations no
convert the coordinates from lat& long to utm system
then take it to surfer by x,y,z(elev)
so u can draw cotour map without going to area.
note:- your coordinates may be shifted by 5 to 10 meter
at the same by using map source[/center]. .
