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.