[BC] GPS recommendations

[D. Wayne Woollard CPBE]

This brings up my consistent worry.  GPS as a Civil Operational System has 
only been with us a short time, 25 years?  there are monitor points and 
directional antenna plots that were inaccurately plotted 40, 50, 60 years 
ago and still in use.
When a Cellular service intends to erect a tower within a mile or two of one 
of these Legacy stations, they contact an independent service to come and 
measure "before and after," measurements of these facilities, based on the 
accurate plots of distance and direction from a "corrected
" tower co-ordinate. Not from the description of the monitor point location 
from the initial Proof of Performance. this "error prone" methodology 
supposedly removes the incoming cell site from any liability should the 
array function correctly according to the measurements provided by the 
independent source, but incorrectly by measurements conducted by station 
staff.
Who is correct here?
----- Original Message ----- 
From: "Broadcast List USER"

> I'm not sure, but I believe every GPS receiver uses World Geodetic
> System (WGS) 1984, not not NAD 83 or NAD 27..  While WGS 84 and NAD 83
> are very close to one another, just a few meters difference, NAD 27 is
> way off, and the hardware conversion inside the receiver is not
> accurate at all.
>
> --chip