The GEODATA Display System (or GEODATA) is a set of tools, executing on a Thinking Machines Corporation Connection Machine (CM), for displaying information which typically relates to specific geographic positions. Commonly this will be the results of acoustic or oceanographic simulation model runs. Such simulations may produce, for example, sound speed or intensity of acoustic energy at regularly spaced ocean points and depths. Since the set of applicable simulations is not defined, a general capability, and not limited to or specialized for ocean displays, is needed. The most basic GEODATA capability is to display simulation data against a two dimensional map or three dimensional terrain background. GEODATA software allows applications to select specific regions for close examination, to control how data objects are represented, and what transformations are applied to form the display. The software supports an interactive mode with the user manipulating the display through GEODATA primitives or through an X Windows control panel. GEODATA is a library of routines. It is intended that display code, in the form of function and subroutine calls, be easily inserted into applications and that essentially no advance planning be required by the simulation developer. GEODATA was a project at the Connection Machine Facility of the Naval Research Laboratory under the direction of Dr. Henry Dardy. Any questions, please contact: Glenn Heinle Code 5581 Naval Research Lab Washington, D.C. 20375-5000 (202) 404-7022 heinle@cmf.nrl.navy.mil