udunits/src/main/java/ucar/units/DerivedUnitImpl.java
@Override
    public final boolean isCompatible(final Unit that) {
        final DerivedUnit unit = that.getDerivedUnit();
        return equals(unit) || isReciprocalOf(unit);
    }
@Override
    public final boolean isCompatible(final Unit that) {
        final DerivedUnit unit = that.getDerivedUnit();
        return equals(unit) || isReciprocalOf(unit);
    }
Indicates if values in this unit are convertible with another unit.

@param that
The other unit.
@return <code>true</code> if and only if values in this unit are
convertible to values in <code>
that</code>.