Supplying Maps (SNS)

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Cartographers do a great deal of business supplying maps of different areas to the general populace. Whether or not a cartographer can supply a particular map to a customer depends on a number of different factors.
The base percentage chance for a cartographer to have a particular map in stock is equal to the cartographer's mapping proficiency plus three times his level. This number is modified by the map's rarity. These modifiers range from +65% (for a very common map) to -65% (for an extremely rare map.
For example, an interested adventurer wants to see if Darnuth, a 3rd-level cartographer, has a map of the city sewers. The DM checks the cartographer's proficiency (16) and figures out that Darnuth's base chance to have the sewer map is 25% (16+9). The DM decides that the map in question is somewhat common and adds 55 percentage points to Darnuth's chance, for a total of 80%.
For simplicity, the DM can simply declare that there are certain maps that a cartographer always has on hand. Conversely, there are some maps that a cartographer simply cannot have in stock. A cartographer cannot supply maps if he does not have access to his studio.