The ambiguity in the guidelines for minimal level cataloging requires that local decisions be made regarding how records will be created. This leads to inconsistency from one institution to another. Map cataloging, whether full or minimal level, requires advanced cataloging ability as well as knowledge of technical map features and mathematical data. The advanced cataloging techniques that are required include familiarity with the country and language code tables, the mathematical data MARC fields, the map fixed fields and proper call number and subject heading assignment for geographic items. Map features and mathematical data include projection type used, scale data, coordinate demarcations and relief denotations.
Geographic literacy is also requisite.
There can be several complicated notes per map catalog record. The call number schedule for maps and atlases is complicated because of the intricate cutter system used for discrete geographic elements. Dates are assigned to call numbers in a unique way for maps and atlases. Choice of proper main entry differs from that of most other items cataloged. The complexity of the cataloging is a barrier to access in at least two ways.