yeah, could be, but ... in catymag's post about compatible devices for this map zumo350 ist listed, IMHO zumo340 is identical firmware, just with centzral europe instead of full europe map; IMHO 390 is also the same like 350 and 340 (but i may be mistaken here) ... so (in my simple logic) if thsi map fits onto 350, it should do the same on 340 ... - comments and experience sharing welcome, c'mon let's ***** this 'nut' ;-))
thxs