NGP^85: Range fire Soviet and NATO tanks?

[Michal]

Just one stupid question:

I thought that:
1 hex range = 0 - 1609 m,
2 hexes = 1610 - 3218 m,
3 hexes = 3219 - 4827 m,
and so on.

In that case, a tank firing at range 2100 m has range of fire = 2 hexes,
and a tank firing at range 1600 m has range of fire = 1 hex.
But I can see, it isn't so obvious?
I can't understand the manner of hex range counting...
Could somebody explain me that?

Michal