----------------------------Original message---------------------------- Hi, Hoping someone can clarify this for me. The Federal Depository Library Manual states: "NOS aeronautical and nautical charts should be stamped 'Not to be used for navigational purposes.'" Is this due to liability? inaccuracy? age of the maps? What do you tell patrons who are looking for charts for navigation? Thanks in advance. Megan Dreger Government Publications & Maps Librarian San Diego State University Library San Diego, CA 92182-8050 Voice: 619-594-5287 FAX: 619-594-2265 Email: [log in to unmask]