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Hello Maurizio, You may be interested in a Surveyor's perspective on this issue. When trying to establish the location of a boundary, a Surveyor will always look for any 'monuments' on the ground. These may be pegs or other survey marks, or could be 'occupations' such as fences etc. Monuments and occupations will generally take precendence over measurements such as coordinates. As Victor Prescott points out, where there is more than one indication on the location of a boundary, for instance a monument and a coordinate, problems can arise (and have in the past). In Australia at least, courts have generally favoured monuments. The problem of monuments conflicting with coordinates was exagerated in the past as a result of practical limitations in the accuracy of coordinates. GPS and vastly improved geodetic datum should result in future boundaries defined by coordinates being far more easily and accuately realised on the ground. As has been the discussed by this group in the past, datum and line types between coordinated points are essential if coordinates are to accurately define a boundary. Regards, Bill Hirst Manager, Maritime Boundaries Geoscience Australia PO Box 2 Belconnen ACT 2616 Ph. 02 6201 4348 Fax 02 6201 4366 Email: [log in to unmask] <mailto:[log in to unmask]> -----Original Message----- From: Maurizio Morabito [mailto:[log in to unmask]] Sent: Thursday, 15 May 2003 19:13 To: [log in to unmask] Subject: Re: INT-BOUNDARIES Digest - 15 Apr 2003 to 13 May 2003 (#2003-9) Pardon me, this surely is an amateurish question, but is there any project to use GPS to define boundaries? I am sure there would be plenty of space in the future for arguments about centimeters of difference regards maurizio __________________________________ Do you Yahoo!? The New Yahoo! Search - Faster. Easier. Bingo. http://search.yahoo.com