A mapping system (200) including: (a) at least one external marker (210,212,214,216) adapted for positioning outside a target (520) to define a target context; (b) at least one target marker (230) adapted for positioning with the target; (c) a data acquisition tool (221) configured to provide position coordinates for at least one data point (220) at the target (520); and (d) a registration module (300) adapted to output position coordinates of said at least one data point relative to at least a portion of the target context.