Traditionally, ocean acoustic signals have been acquired using hydrophones, which measure the pressure field and are typically omnidirectional. A vector sensor measures both the acoustic pressure and the three components of particle velocity. Assembled into an array, a vector sensor array (VSA) improves spatial filtering capabilities when compared with arrays of same length and same number of hydrophones. The objective of this work is to show the advantage of the use of vector sensors in underwater acoustic applications such as direction of arrival (DOA) estimation and geoacoustic inversion. Beyond the improvments in DOA estimation, it will be shown the advantages of using a VSA in bottom parameters estimation. Additionally, is testet the possibility of using high frequency signals (say 8-14 kHz band), acquired during the MakaiEx 2005, in order to allow a small aperture array, reducing the cost of actual sub-bottom profilers to allow a small aperture array, reducing the cost of actual sub-bottom profilers and providing a compact and easy-to-deploy system.