I think its more the instrument tripod that is moving a tiny bit that is making a largish (0.04 foot) change to the backsight. I'm going to check my s...

Yep i tighten everything up good but i know my setups are moving. I only have to look at my prism carrier's level bubble after a while. Half the time ...

When the drift occurs I look through the optics of the backsight and set on station. Both are perfectly centred so surely wobbly tribrach or tripod ca...

I like that - great idea thanks

Do people really consider a resection less accurate that setting over a point? Surely not or we would use it so much for construction stakeout

Okay so do i observe 3 stations in the onboard resection program, get my position esrablished and move on only if the deltas are low OR observe 2 stat...

that's all great advice - many thanks its much appreciated ????ÿ

How much of a deviation from the original control co-ordinates would you start getting nervous about? Sure it depends on what's being built, how close...

Cheers fellas - I reckon the best thing to do is to tell the construction firm how the original control checked out and get them to confirm in writing...

thanks for the help guys. Good idea about putting holes in the ply and sighting the control outside

Cheers Bill I can take the odd sheet of ply off and put back after afterwards. After transferring control into the site. Do you agree with the other...

where would you guys put them or would you set prisms over nails instead? There are many tall buildings surrounding the site where targets could be mo...