But Novus actually doesn't use any sort of grid or hex system internally, nor does it assume that players do as well, that is why there no mention of such. However, the we do recognize that the standard is 5'/1 m per square or hex, and if you look at the entry for Control Zone, it presumes a 5' control zone (and that image shows 1 hex as the control zone, so the base assumption is 5' per hex).
If it had differed from that base assumption of 5' per, then I would have made specific note of that..