As a qualified and licensed surveyor (now known as "land information systems") I would suggest that you keep your references to methods of determining degrees and distances to a subject that you are familiar with Wouter, you obviously are not intimately familiar with the methods used in land tenure or surveying in general, which is not unusual as few people outside the profession are, but in our profession we find that "engineers" feel that they know all there is to "surveying" when in actual fact, they are greatly mistaken.