I may buy a Garmin satellite map thing at some point. But if I do, it's an absolute requirement for me that it will allow me to feed it some sort of list of GPS coordinates with labels, such as putting a
custom.csv file onto its flash card containing something like:
12.45677,12.45677,"My old house" 12.35677,13.45677,"The park where I met that pretty girl" 15.35677,11.45677,"My best friend's house back in the day" ...
I have such data in my own map system on my computer. I can make it output a reasonable file format.
Surely those devices support this? But I'm still asking because you never know... Companies like to do stupid things and cripple you with vendor lock-in and weird, proprietary binary formats and whatnot. I hope such isn't the case for these, because I would basically have no use for it if I cannot feed it my existing data points.
If it also supports dumping any points I add on the device itself onto another .csv (or similar) file, such that I can import it into my computer and thus keep the two maps' "points of interest" synced, that would be great as well. I wonder about that as well.