Siderean Upgrades Search Platform

El Segundo-based Siderean, a developer of search software for navigating large volumes of information, has upgraded the firm's flagship Seamark Navigator product. Siderean said Monday that Seamark Navigator 4.5 adds new user-participation capabilities, including tagging, voting, ranking, and reviewing of information, along with other enhancements. Siderean's product is used to navigate and search for information. The firm is backed by Clearstone Venture Partners, InnoCal Venture Capital, and Red Rock Ventures.