On some of the lines in the Ionian Sea and in the totality of the lines on the Aeolian Islands we towed a "handheld" (Fig.14) Mod. GSM-19D magnetometer by GEM Systems. The data were directly interfaced to NAVPRO, therefore being available on the navigation files with the POS1 position (see Tab. 3 for the offsets).
The data must be corrected with the M.Etna and L'Aquila Observatory data, filtered and the local anomalies computed with the IGRF-2000 model, as shown by [5].
A very crude and preliminary map of the data acquired in the Ionian Sea can be seen in Fig.15, where the raw data have simply been corrected for position and de-trended by a 3d-order surface to obtain the regional anomalies.
