Abstract: An underwater navigation system is provided, comprising: a transducer configured to emit a first and second acoustic pulses separated by a predetermined time period; a receiver array comprising a plurality of acoustic receivers each configured to receive first reflected portions of the first acoustic pulses and second reflected portions of the second acoustic pulses; the array including a plurality of neighbouring pairs of acoustic receivers wherein a distance between a first neighbouring pair is different from a distance between a second neighbouring pair; and a processor coupled to the receiver array, and configured to generate a velocity measurement based on the predetermined time period and signals from the receiver array representing the first and second reflected portions.

Abstract: A self-retracting hook device for positioning on or near a door provides support for grocery bags or the like while remaining in a retracted position against a surface when not in use. The device includes a mounting plate having a front face and a back face. A bracket is coupled to the front face of the mounting plate. An arm has a lower end pivotally coupled to the bracket such that the arm is pivotable between an extended position and a retracted position. A biasing member is coupled to the arm and the bracket, the biasing member urging the arm into the retracted position.

Abstract: The present invention relates to providing on-line tools for property-related on-line calculations. A distributed computer network can enable a user to access multiple databases and to obtain comparables data related to a property of interest for use in calculations. A user can access the latest, broadest set of relevant property data and to select relevant comparable values quickly and with minimal manual intervention. An on-line property management environment can comprise a distributed computer network coupled to numerous client computers, a property services server platform connected to a local data base, and numerous property information databases. A valuation tool, lease improvement calculator, refinancing calculator, capitalization rate calculator, mortgage and amortization calculator, and an affordability calculator can enable a user to make multiple property-related on-line calculations.

Abstract: The present invention relates to providing on-line tools for property-related on-line calculations. A distributed computer network can enable a user to access multiple databases and to obtain comparables data related to a property of interest for use in calculations. A user can access the latest, broadest set of relevant property data and to select relevant comparable values quickly and with minimal manual intervention. An on-line property management environment can comprise a distributed computer network coupled to numerous client computers, a property services server platform connected to a local data base, and numerous property information databases. A valuation tool, lease improvement calculator, refinancing calculator, capitalization rate calculator, mortgage and amortization calculator, and an affordability calculator can enable a user to make multiple property-related on-line calculations.