Measuring (SNS)

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Cartographers who wish to improve their chances at creating a perfect map can actually take measurements instead of simply attempting estimates.
This can only be done in smaller areas in which measuring is possible. Many cartographers use a ball of tough twine, knotted at one-foot intervals, with even larger knots at one-yard intervals. Measuring an area gives a cartographer a +2 bonus to his Cartography checks when making a map.
Measuring, however, is a time-consuming process. When a map needs to be made in a hurry, a cartographer must rely on his own skills instead of any tools. This particularly applies if the cartographer is in a dangerous area-like a battlefield or a dungeon populated with hostile creatures.