The 6th Cambridge survey of radio sources covers most of the sky north of +30{deg} with an angular resolution of 4.2x4.2cosec{delta}arcmin^2^ and reaches a limiting flux density of 190mJy at 151MHz in the present zone. In this paper the methods used to produce the survey maps from a non-tracking telescope operating at declinations other than the north celestial pole are described: this forms the basis for all future papers in the series. Maps of a high galactic latitude region are presented 30{deg}<{delta}<51{deg}, 08h30m<{alpha}<17h30m, together with a list of 8278 sources in the 2030deg^2^ covered. A source count over the range 200mJy<S(151)<100Jy is derived.