Deprecated proj 18281 and projCRS 2171. Added replacement proj 18280 and projCRS 3120. Added naming system 9314 and alias to projCRSs 2172-2180. Added proj 18286, projCRSs 3328-35. For areas 1792 and 1793 (used by projCRSs 2493-94 and 28403-04), deleted reference to Poland. For area 2068 (used by projCRS 32635), added Poland. For transformation 1644, added remarks "Parameter values given to greater precision but to no better accuracy in GUGiK Technical Instruction G-2, Warsaw 2001".