Very interesting comment on data. Here are 2 examples of other difficulties one may encounter. For instance: a label says: collected on Rd 18 from X to Z going southwards at KM 7 in 1980(no GPS available)In the meantime the road has been rebuild and does not follow the same path. How can anyone spot exactly the place at a later date without carefully checking where the old rd was going tru? Another example about self collecting snails in a Filippino village. Once the kids see you pick up something, they will help you collect some more. Since they have to walk (but they could also take a tricycle without your knowing it)you can therefore assume more or less the collecting area, considering the time they have been out of sight.One problem of locality was raised the next day when some other or same kid brought me a bag of same helicostyla species. I imagined wrongly they were from the same place.No , they were from another island. I found out after noticing that the average size of said helicostyla presented an average much smaller size and it is only after questionning the kid in Tagalog that I learned about the name of the island which was only a few miles away. Another example: while doing some island hopping in the Calamian Archipelago, do not expect the natives that carry you on their boat to tell you exactly where they are . They could not even show you on a map where you are.For those of you who know such archipelagos with tenths of different islands, I hope you will agree there is definitely a problem (communication possibilities)to know exactlyw where you collect if you have no GPS. As far as PI localities are concerned, do not expect any local diver to tell you exactly where his leucodon exactly come from. And certainly do not expect him to take you to the place. Plenty of localities are just guesses.