That's good thinking if you're doing a topo.
"One thing i am totally misunderstanding is you use TRK and semi active passive etc. TRK is the EDM period so distance only.<div>
I use TRK to stake out the point, then set it. Then finally before storing measure to be sure it's within our tolerance, usually 0.010m but sometimes tighter than that.
"The Passive and semi passive or active is for how the instrument tracks a prism mode. And it’s really only an improvement in the vertical when using semi active mode. Honestly. Now the 6mm issue is that vertical like cut fill or distance. If distance i can see that especially as you wait for the updated info from robot. It is slightly delayed. So when i am staking horizontal in out left right."
Sometimes it's left or right, sometimes it's distsnce that it changes by. In semi active it's going from the LEDs to the glass for angle and distance.
"And its in TRK mode so always shooting a distance. Once i get close say a few mm. Since you work in metric say 3mm. I drive my rebar set up on point and watch it. Because it was still locked and shooting as i was plumbing up etc so its constantly updating. Once it settles i do whatever bumping in out to get it to the requirements say less than 3mm in out left right. Don’t make a rookie mistake if you see or hear for whatever reason radio link down while it’s shooting. Pause as it will have the last message which could been delayed more. Now if you say semi active passive is for vertical i can believe that. But for distance not as much. That would mean if you are totally still the instrument is not within the manufacturer specs . I think if memory serves me it is only 1mm + 1ppm difference between std edm mode and trk edm mode"
I am more quick to use semi active when I'm doing vertical or a have an excessive vertical grade to where I'm shooting, but still I'm mainly talking horizontal as we only have to give one cut stake per house when pinning them. There is a difference between tracking and shooting semi active, in my experience, though very small most of the time. It's enough that if I want to keep error to a minimum, like laying out gridlines that we'll be setting up on, or setting control, I will always use semi active if using the mt1000.
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