Agree with Zobex, depends on many things. We can get free why not. I have a site which my friend who rents out his detector, scanned for me for free. Scanners with graphical representations are ideal for validating (measuring) what a live-pointer tells and what a "dowser" see. attached image seems to suggest that the red fillet indicates a non-ferrous object beneath. A boredrill is necessary as a confirmatory approach before recovery. However, recovery has to be planned well before implementation as it may require a lot of resources. The GPS coordinates below the image were intentionally erased to protect the site.
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Well there is several factors on doing scanning for someone else.
1.) In the islands there is rich people, well off people, working people and poor people. It depends on who has the scanner and who wants the scanning done. Generally poor will help poor on a friendship level or on a joint venture. Working people with working people is usually a joint venture. Well off people, they can pay or they buy their own. Rich people hire other rich people to scan for them.
2.) I feel like dirt trying to take money from people who are already poor and trying to get ahead, why, well because I am not poor.
3.) I charge a San Miguel Lite or a lunch or such because that gives us a time to all set down and talk about the site, is it good or bad or are there other sites that might prove out to be good that they know of. Also what is the history of the area they know of or any still living eye witnesses. Those still exist. I have also found that the poor people are NOT cheap like rich people. The poor are the ones who always offer to feed us and we never even have to ask or say anything. So when they ask what I charge I say a beer or food and that makes them happy because it is not begging or pan handling and generally they can afford a few SML's at 23 peso each.
Z