Or, I've done this: Copy the unlocked map and D3191090A.vcj to an sd card without its .unl to try in another unit (i have genuine files in 3597, copies on microSD in 3590). A route from Chicago to Milwaulkee side by side shows the same JC views np. But the unlock code is not there for fun [April Fool's Day is long passed, and Garmin has little corporate sense of humour in my experience]. Dasil is right imo. There is something coming. I though it was maybe already here and had something to do with ALG in 2013 models, but if the unl is popping up in other units without ALG function then that theory is probably wrong. Can someone confirm that other units get it too?