This paper focus on an original magnetic survey with a high spatial resolution used to map the Neolithic site of Le Pontet at Saint-Nazaire-sur-Charente (Charente-Maritime, France). The protocol involves to use a motorized total station to locate each magnetic data measured by a G-858 magnetometer. The data processing enables to enhance the magnetic map and to obtain a final error of location of a few centimetre. The accurate localization of measurements by the total station permits to understand the magnetic intensity variations between two consecutive profiles in slope (variation of the height of the sensors during the uphill and the downhill). The using of the topographic data of the total station will enable to correct the variation of magnetic intensity induced by the relief. The results of the magnetic survey allow to bring out several causewayed enclosures, pits and postholes. The archaeology excavations will be positioned on the basis of magnetic survey.