Considering his large experience in magnetic surveying with the fluxgate magnetometer I have read with great attention the Letter to the Editor sent by Mr. William Kellogg about high sensitivity magnetic surveying. Most of his remarks confirm his experience. It is, however, a fact that high sensitivity magnetic surveying is quite different from conventional airborne surveying. CGG has now flown some 200,000 miles with the high sensitivity magnetometer and has just started to understand how different are the results obtained. In any method, a factor of ten gained in sensitivity changes completely the quality of the results and everyone has to get used to the new equipment before understanding all its advantages.

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