ADMIRALTY Digital Radio Signals Volume 2 (ADRS2) provides a range of regularly updated and compliant, digital positional and timekeeping references.  ADRS2 is provided on the complete Admiralty Digital Publications CD, but you can purchase just what you need – from one area of one product up to all areas of all products.  ADRS2 is carriage compliant, approved by most Flag States and kept fully up to date.  We can supply free trial versions;  just provide your name and contact details and email a request.