Thanks my friend.... I thought I remembered it wasn't that tough if you had those two items but as I said, getting Old Sucks:-D

I hear you Loud and Clear my friend. Been Surveying for 37 years and really never had to do this? Work for the BOR and they are building 200 miles of ...

Thanks, yes I have excell.I also have TBC but am just getting started on it. You can email at jimfarren_pls@msn.com if you wish... Thanks again

Thank you for the reply. So far you have made the most sense but still confused COMBINED FACTOR (GRID) = 1.000002425 (example)1 / GRID = 0.999997575L...