Earlier quoted context omitted.
natives of grid-based cities can always find north as well. Interestingly the street grid isn't a language feature.
My city is grid based, but downtown is rotated 45 degrees from the cardinal directions. This leaves me constantly confused and confounded while downtown, not least because the transition streets from downtown to the rest of the city are all at crazy angles (that is, unlike anything where I grew up). As you say, this isn't a language feature. For me the concepts of N,E,W,S and the easy visualization matters more than…
It sounds like you're not a native -- in your observation, is the ability to navigate easily in the 'rotated downtown' area correlated with having grown up nearby?
That would make a cool study.