I want to know the difference in this 2 dgps, I want this to do presice job like make topo maps.
Jou
ProMark2 units are static only. You will be able to set control points from which you can do conventional topographic work from, but that's about it. ProMark 2 performs extremely well in static (L1 only) needs. If you want kinematic capablilties the Locus system can handle your needs, given good satellite visibility and constellation. If you want RTK, Ashtech has other options available. I'm sure an Ashtech rep can answer any/and or all your questions.
J.D. Billings, TX RPLS