A method and apparatus for delivering engineering data to a portable device for use in performing an operation. Engineering data for each part in a set of parts is stored in a file system on the portable device. A set of entries, each entry including a part identifier and a target locator for a part, is created for the set of parts to form a table. An initial locator constructed by a visualization tool is matched to a target locator in the table for a selected part. The target locator identifies a physical location in the file system of requested engineering data for the selected part. A local server on the portable device retrieves the requested engineering data based on the target locator. The local server serves the requested engineering data to a browser, which displays the requested engineering data for use in performing the operation on the selected part.