Thanks for the quick fix. My terrain is about 3x3km and I’ve got the grid scaled up so each hex is around 100m. I’ve got everything offset so the center of the landscape is at 0,0 to minimize any floating point in inaccuracies at the extremes (considering going larger at some point, but using this as my minimum viable size). Having this issue now is a little serendipitous, as I’ve now learnt that the functions needed to convert to and from grid and world space exist 