A carrier (100, 200) for use with a fastener driver (290) and a method (300) for discharging fastening elements at uniformly spaced intervals from a fastener driving system (205) comprising the fastener driver (290) and the carrier (100, 200) is disclosed. The carrier (100, 200) includes: a platform (110, 210) for supporting the fastener driver (290); at least one motion element (120a, 120b, 120c, 120d, 220a, 220b, 220c, 220d) coupled to said platform (110, 210) and supporting the carrier (100, 200) for motion over a surface (180, 280) to be fastened; an imaging sensor (130, 230) attached to said platform (110, 210) and configured to determine and output values of displacement traversed by said carrier (100, 200) as it moves over the surface (180, 280); and a processor (140, 240) operably coupled to said imaging sensor (130, 230), and configured to receive the said displacement values and calculate based thereon a distance traversed by the carrier (100, 200), wherein the processor (140, 240) is further configured to compare the calculated distance with a predetermined spacing value and generate a signal in response to the calculated distance having a magnitude equal to or greater than the predetermined fastener spacing value. The predetermined spacing value corresponds to the spacing with which fastening elements are to be discharged from the fastening driver (290) and thus the pitch of the fastening elements in the fastened surface.