What I've started to do is to just use one flag for a larger deposit. Most if not all up-to-choice mats on continents come in clusters. This also saves flags, as their number is limited.
In the Thesos example above, I just put one placemark named "Anete | Koorin | Enola | Perfling | Splinter" in the rough area where they are, and go from there. Same for the deposit in Thesos Falls Tor or the ones near South Range, etc. After a while you start caring less where exactly the mats are, and just adjust your mat spec and prospection range to pop.
In the Thesos example above, I just put one placemark named "Anete | Koorin | Enola | Perfling | Splinter" in the rough area where they are, and go from there. Same for the deposit in Thesos Falls Tor or the ones near South Range, etc. After a while you start caring less where exactly the mats are, and just adjust your mat spec and prospection range to pop.
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