Abstract: Nautical apparatus to conduct reconnaissance missions of a site, particularly bathymetric surveys.A nautical apparatus to conduct reconnaissance missions of a site, particularly bathymetric surveys by means of sounding, comprising a floating hull, inside of which motor and directional elements, means of geographic localization of the apparatus, measurement instruments, and means for taking into account each measurement in association with the time of the survey and the geographic situation of the apparatus at the time of the survey.