... Dang you guys beat me to it... anyways.
A few tips: the most efficient Geosurey unit is one with 2 geosurvey modules. I personally build my Geo-Survey "battalion" to be 10,000 Tons using 45 Geosurvey Vehicles, this gives you a default 9 Geo Survey Points per day for the unit.
You use the same process to make Construction units and Xeno-archeology units.