@pozidriv this is off topic but a reply to your question.

Well, from what I understand from 2012 or something like that to about 2015 there where a lot of maps G2 and G2 Vision released on other forums but the active users uploading stuff got "size and desist letter" from Garmin or lawyers. So they stopped releasing the maps. This was some time ago and now G2 and G2 Vision is -> G3 and they probably moved to making it a more G3 Vision maps only if you buy stuff from Garmin. I do not think you can buy older maps any more.

I guess new hardware made it easy to do that plus the market for BlueChart maps is probably not what it once was. Things in the ocean do not change that much so you can use older maps without to much problem if you have a smaller boat. Most larger commercial typ of things probably do not use Garmin and have a computer with world maps on board the boats etc. There are plenty of sea chart maps and mapping software.

BlueChart G3 Vision EU722L Request!

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Finding G3 maps to download is probably hard if they are even released at all. You can always buy them of course which is what you should do if you buy a new GPS unit. The only advantage with the older maps is they work on older second hand hardware. I think that new hardware will only accept G3 maps but I am unsure.
dennisolof Reviewed by dennisolof on . BlueChart G3 Vision EU722L Request! https://media1.svb-media.de/media/snr/509904/images/fullsize/img_2018-06-11_11-50-33_7b6f98b6a7b7543d3bb1f4aecf7643c4.jpg I need this map, anyone have got it? Can upload them? Rating: 5