Existing Sokkia GRX-1 base and rover system. Upgrade or not?
Bruce, thanks for your reply.
At 80, it's harder to learn.
In AZ, you have lots of sky. If you are good at learning new tricks, ok, but if not, stay with what you have. You won't see great gains, in the wide open.
I agree REPEATABILITY does not equate to accuracy.... So, do your test like this:
Set 5 nails down in the gnarly hole between some trees.
Set 2 nails out in wide open use one for backsite, occupying the other with total station. Take doubled angle shots on the 5 nails. Now gps on them. With a javad.
Do this all day long. The scatter of epochs, and shape of the scatter will generate a single coord, with an estimated accuracy, that is reasonable.
I will agree that decade old GPS equipment should be upgraded because it has made quantum leaps in that time. New equipment will change your life. Trimble is great stuff but spendy, Carlson makes a fine receiver that I've heard good things about.
I spent a lot of time deciding which way to go and went with Javad and couldn't be happier. I have their latest and greatest and it gets shots (good shots) in places you would never believe. More than that, the information available on each shot allows you to instantly judge how trustworthy each shot is. Another bonus is the compact package. You can put the rover head on a collapsible lightweight pole and it is its own data collector so no heavy chunk on the side. You can also get the Jtip which is a screw on metal detector on the bottom of the rod and head deep into enemy territory by yourself with less gear and weight. I am also a solo guy and lean and mean is important.
Not sure how fast you want to make a decision but the decision makers at Javad corporate have realized that word of mouth has been their best advertising so they have knocked off 25% for a base/rover package until the end of May (Monday) I believe which will save a purchaser over $8,000. You can get what I think is not only the best priced but the best GPS equipment available in the world for about $25,000. Like Nate, I am not a salesman, just a surveyor that loves his equipment.
So I’ve used the Topcon Hiper VR base & rover system about 2 years ago with a Topcon FC5000 & Pocket 3D software before for extensive topo under selectively cleared pine canopy (Longleaf & loblolly pines that were maybe 50-70’ tall). The developer preferred to have smaller swale easements every lot line or sometimes every other lot line @ 100’ apart so the contractor used a mulcher on every easement & the 60’ R/W for the streets.
site was calibrated using another’s control & everything checked really tight but majority of the control was fairly open. Up on the high point the GPS worked flawlessly. On the low side of the site surveying the edge of wetlands (very thick & not cleared) I would occasionally lose RTK lock but regain it within 30 seconds or so - you can always tighten or loosen your acceptable tolerances for this. I decided since there was plenty of poison still around that I’d ride the site on a Kubota with the tablet & rover with the base setup on the high ground. Was able to topo the site in half a day with multiple stops due to the Kubota dragging debris. That being said - I would try to reobserve really important horizontal & vertical aspects multiple times at several hours apart where possible
Upstate NY....javad ls plus and t3 user...very happy....just the support and javad community is worth giving them a shot. Browse their web site and youtube channel and see the kind of company they are. Guys in the field involved in support and design every day