You need same approximate height from where you are taking data, you need to actually run out and be on at least 2/3rds of all locations you want on your map measured from, in a certain order.
Note down specific data and once that is gathered for the locations you want its all about painfully going through all the data and making a map.
Depending on how many points of data you add per object you get higher precision, but the minimal of 2 is enough for making a rough map.
The entire thing starts with measuring up ONE point of reference to decide the distances for the entire thing and then used for the entire map.
This is done with a different method entirely, but is using the data from the other measurements. Since we have our movement speed in a tangible metric ingame it'll be easy to measure by foot to get the initial measurements.
The main thing this saves is the time spent measuring distances between objects by foot like we did last time.
The main shortfall is its impossible to measure the size of objects to any degree of accuracy and its not what the method is meant to do anyway, that has to be done with different methods.
For a first map draft getting all POIs, such as mountains, significant hills, structures, towns, big rocks etc noted down to a location in relation to other objects is more than enough.
There is a reason why i'm waiting for horses for this shit.
Plus i'll make a sheet that lets me basically generate a map from the data if i want to do it that way.
Prep work will almost be more work than the actual legwork.
Im too swamped in studies, cyberpunk coming out and the fact i'll be gone for work soon.