Jim - thanks for the PMs...helpful as always Kiril - How accurate do you think the "cheap" solution can get? For us, we'll have 40 or 50 sleeves on a site, so 80-100 spots to dig. Some investment in time in the burying is worth it given how our guys lose so much time in the finding. But... if we can have reasonable accuracy, and use GPS to get us to the right area and maybe combine with rebar laid out to allow us to do an exact hit...we may be getting somewhere quite useful. How far down can the metal detectors people are using pick up rebar? Our sleeve ends are usually 36" down for road crossings... of course they go in so early that you have to assume +- or 12"