No problem at all, i didn't think that anyway. Just wanting to ensure ppl didn't take the info you quoted from the other forum as gospel that's all [it was muell9k who said that btw, not alandb who in fact along with CraigW posted to correct him in POI Factory forum as to the correct placement of the Map folder]. In precis, their point and my point in Post #9 here is that the 'Map' folder must be in the root of either card or unit which is why meull9k couldn't get his image to work because he had Map as a sub-folder.
In the interests of total accuracy and to supplement and reinforce xtrail's excellent post above:
This is the map naming convention for image files which will work in all units nuvi 1xxx to 3xxx series [including your 3590] and some related dezl and zumo models with on-board .System and Map folders and microSD card usable Garmin and Map folders:
In unit's .System folder: gmapprom.img, gmapprom1.img [and for some maps gmapoem.img].
In unit's Map [root] folder: gmapsup1.img and anyname.img.
In card's Map [root] folder: anyname.img.
In card's Garmin [root] folder: anyname.img and gmapsupp.img [that latter name only works there, and it won't work in the unit's Garmin folder, and anyname only works in card's Garmin folder for more recent units, not 1xxx].
There are differing conventions for earlier models such as nuvi 2xx[W]/3x0/465/5x0/6x0/7xx etc and related units which don't have the hidden .System folder and use maps in the unit's Garmin folder. Other relevant threads in here: [Only registered and activated users can see links. ] also [Only registered and activated users can see links. ], and [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ] for earlier units.
One thing that is universal with Garmin devices [automotive, outdoor, marine, aviation] which use a removable media card is that all of them can use a valid map named gmapsupp.img which always works in [card]:\Garmin folder and that's the definitive test for any map image. If it doesn't work there providing the map's suitable for the unit then there's something wrong with the map.
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