Coordinate translator

Supported grids for NdG: 'rW', 'rX', 'rY', 'rA', 'rB', 'rC', 'rD', 'rE', 'vK', 'wF', 'wG', 'vP', 'wL', 'wM', 'wN', 'wO', 'wP', 'vU', 'wQ', 'wR', 'wS', 'wT', 'wU'