For 5,000 square meters?
9,000 pesos, for a tape measure at sodimac.
If you want to get really fancy, buy one of those hand wheels with the distance clicker on it.
If you want to do the drone thing, take your cell phone, set it to record video, and throw it up in the air a couple of times. You will probably get all 5,000 square meters in the shot.
I am only half joking about the above.
Typically when I buy a 5,000 or even up to a couple hector property, I take the legal description in the title, my super long 100 meter measuring tape (I keep meaning to buy one of those wheels), and go out and see if I can find any obvious discrepancies in the legal description relative to the physical land. I can add, subtract, and even manage a bit of geometry, just as well as any engineer in Chile.
If I see anything too strange, relative to the legal description, that I can not explain or account for, then I might consider hiring a licensed engineer to measure the property formally because either the title description needs to be corrected or the plot map needs to be corrected. Which at that point you will need an attorney and / or licensed surveyor to make the corrections.
Even before that, if I find something strange, I typically pull the neighboring titles to see if their property descriptions will explain the discrepancies in my measurements. I like to have a good idea of what the problem is before, hiring someone else to measure.
I also have a builders level and builders laser level, if I even care what the real meters are like inside the property in 3-D. They take a bit more math to use, than say a proper transit level, but I figure they are more accurate than what the Incas or the Egyptians had to work with, at least for a small property.
I also typically don't find it worth the time to mess around with say a small discrepancy, on a small property, in areas that essentially not usable anyone. For example, a ditch bordering a property, with a 0.25 meter fuzzy zone full of blackberries or whatever, that neither I nor my neighbor would ever use. Simply not worth the time and money in most cases to mess around with trying to fix it, if it needs fixing at all. I just sign the title of that part of the property over to the wildlife, and get on with my life.
Surveyor prices are typically dependent on how hard it is to access the property. Typically we pay say 300,000 to 500,000 pesos, assuming it is relatively easy to access property. Prices go up when you start talking about big properties you need a horse, plane, boat to access remote ends of the property. For example, a 200 hectare property in the Patagonia, is going to cost you a more to have surveyed.
Now, all that said, we fix property titles for a living. I see hundreds of titles and plot maps a year, both good and bad. If I get a little loosy goosy with my own property lines when buying, I know how to fix them. I think I own three properties right now I have never bothered to measure ( 'Yep, that looks like about two hectares to that old rotting tree, I'll take it' ).
However, even for our clients, we do the title search first, then make a call about needing a survey. I would say remeasuring the property is about 80% of the time a waist of money in the south for most properties. That all depends on the area. For example, deep in the Patagonia, Chaiten or Futa south, then definitely surveying get's to be more important, as there are a bunch of historical problems with the surveys in those areas. Further north, say North of Pumalin park, typically they are worth it only if there is a good cause for it.
There are times however I would be very careful. For example, there is a river or other body of water. If the property had some sort of expropriation association with it, say a road. Things related to easements to access the property, or to allow someone else to access the property. Typically issues of that nature show in the title search first, and then you see if there is something worth going out and physically verifying.