Abstract: A method and apparatus for determining the topography of a seafloor includes providing a vessel with a multibeam sonar device which transmits first pulses of first signals, and a pair of sidescan sonar devices, which transmit second pulses of second signals, spaced apart rearwardly from the multibeam sonar device on the vessel. The first and second pulses produced by the multibeam sonar device and the sidescan sonar devices, respectively, are interleaved, and the time duration between each second pulse and the next following first pulse, and between each first pulse and the next following one of the first and second pulses is determined as a function of the maximum time-of-flight of the first signals of one of the previous first pulses from the time of transmission thereof to the time of reception of the backscattered first signals.

Abstract: A method and apparatus for determining the topography of a seafloor comprises providing a vessel (1) with a multibeam sonar device (5) and a pair of sidescan sonar devices (10) spaced apart rearwardly from the multibeam sonar device (5) on the vessel (2). The multibeam sonar device (5) transmits first pulses of first signals directly downwardly towards the seafloor with a wide fan angle (?) in a first vertical transverse plane (7). The sidescan sonar devices (10) direct second pulses of second signals of similar wavelength to those of the first signals downwardly and sidewardly outwardly of the vessel (2) with a wide fan angle (?) in a second vertical transverse plane (11).

Abstract: A document holder that is either floor mounted or table mounted, capable of holding and displaying out-sized documents. The document holder is composed of a vertical stand, a support arm and assembly which is mounted on the stand so that it can rotate and an extension rod assembly which is suspended from the overhanging end of the support arm. The extension rod assembly includes horizontal rods to which out-sized documents can be attached and displayed. The holder includes provision for a seated user to be able to remotely adjust the height of the extension rod assembly or to swing the support arm and assembly in a horizontal arc to a desired location while remaining seated. An alternate configuration has a support stand with a horizontal rail on which the support arm assembly can ride from one end to the other. This adds a remote horizontal moving capability of displayed documents for a seated user where required for special applications.