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I want to make overlay with hexagon or squares over google map with MKMapKit. Not just one hexagon or square, i want to use google map like a tile based map with full overlay with hexagons in every 1km area. I know app will crash if i do the overlay in one process so i want to do it only on the viewable portion of the screen but in that case i have difficulties to make the distance from the start point, its not getting on the right point or hexagons are not same size everywhere etc. My question: lets think i have 1 thousand hexagons in the viewable portion, so what is the best way to place them with a equal distance at once, how should my calculation ? if i scroll the map, how should i calculate the new start points. or should i give up from hexagon and use another think ? i hope i give you a clue for what i have try to do, any helps, any examples or any ideas are welcome.