@classmethod
def dec_deg2deg_min(cls, coord):
    """Convert decimal degrees to degrees.minutes"""
    if coord < 0:
        sgn = -1
        coord = -coord
    else:
        sgn = 1
    deg = cls.int_trunc(coord)
    minutes = abs(coord - deg) * 0.6
    return sgn * (deg + minutes)
