MAP_ROUNDING

          MAP_ROUNDING     Real

    Maximum error which can  be  tolerated  between  optimal  size  (  given  by
    MAP_FIELD/MAP_CELL)  and  its  rounded value MAP_SIZE (as a power of 2^k 3^p
    5^q) when rounding by floor (thus limiting the field of view). If the round-
    ing error becomes larger, rounding is made by ceiling,  which  guarantees  a
    larger field of view, but leads to bigger images.

    Default is 0.05.