Detecting False Maps (SNS)

__TOC__
To detect a false map, the cartographer must rely on his Forgery proficiency. The DM makes the detection roll secretly. If the roll succeeds, the cartographer knows whether a map is authentic, or whether it's a clever forgery. If the roll fails, the cartographer is uncertain about whether the map is a forgery or not.
If the DM rolls a 20, the cartographer incorrectly identifies the map as the opposite of what it actually is (authentic or a fake). For example, a cartographer who critically fails his check (rolls a 20) might identify an original map as a forgery.
A cartographer must have access to reference material (other maps, history texts, etc.) to attempt this detection. Cartographers receive a +2 bonus to their Forgery checks when in their own studio.
Cartographers try to protect their reputations and will use their studio (and get the resultant bonus) whenever possible. If this is not possible, they usually give their opinions with the warning that the absence of their own reference materials may adversely affect their evaluation.