Method for charting onto a newly produced map mains networks from an old, already extant map, comprising the following steps of:- storing in a first memory part the measured data for a new map;- storing in a second memory part the data of the old map including the data relating to mains networks included therein;- reading from the memory parts the new and the old map and displaying thereof on a display means;- moving reference points of the old map until these coincide with the appropriate reference points of the new map; and- interpolating the network reference points moved with the reference points of the old map so that the network data is included in the new map.
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