The Regional Guidance Material developed by the MIDANPIRG Radio Altimeter Action Group (RADALT AG) will be presented. The guidance material includes the following chapters: Background on 5G and frequency band allocaion, potential impact of 5G operation on Radio Altimeter during aircraft operation, short term safeguarding measures adopted at regional and global level/long term planning and methodologes for defining safeguarding measures for aerodromes and heliports