The Field Integration Design and Operations (FIDO) rover, developed by the Jet Propulsion Laboratory [1 and http://robotics.jpl.nasa.gov/tasks/etrover /homepage.html], is a prototype of the 2003 and 2005 Mars Sample Return rovers and associated Athena Science Payload [http://astrosun.tn.cornell.edu/athena]. The purpose of FIDO is to simulate, using Mars analog settings, the complex surface operations that will need to be accomplished to find, characterize, obtain, cache, and return samples to the ascent vehicles on the 2003 and 2005 landers [http://wundow. wustl.edu/rover]. FIDO is 50 cm wide, 94 cm long, and 45 cm high, with a mass of approximately 45 kilograms, and has six 20 cm diameter wheels. FIDO is powered both by solar panels that cover the top of the rover and by replaceable batteries. It is commanded in the field through a wireless Ethernet from a command trailer using the Web Interface for Telescience [http://robotics.jpl.nasa.gov/tasks/wits/homepage.html]. Data obtained by FIDO are also transmitted through this system back to the command trailer. The trailer has satellite link capability, allowing remote science team members, the public, and students to "participate" in the field missions using the Internet. The first major field test will take place in the Silver Lake area, Mojave Desert, in April 1999, following the protocols outlined during the Rocky 7 rover tests at Lavic Lake [2]. Instrumentation on FIDO is designed to simulate as closely as possible the Athena Science Payload. Specifically, a 1.7 m high mast is included that is stowed on the deck of the rover as the vehicle is moving. The mast head houses three instruments that comprise the remote sensing component of FIDO. The Pancam is a false color infrared stereo imaging system (approximately 10 degree field of view and 15 cm baseline) capable of surveying the terrain at high spatial resolution (0.35 mrad/pixel) for scientific purposes. The Navcam is used for planning traverses and has low spatial resolution, wide field of view (1.5 mrad/pixel and approximately 40 degree field of view) and broad stereo baseline (23 cm) as compared to Pancam. The Infrared Point Spectrometer (IPS) is boresighted with Pancam and acquires spectral radiance information over the wavelengths from 1.25 to 2.5 micrometers with 13 cm resolution. An IPS pixel covers 9 by 9 Pancam pixels. IPS can be used both in a point mode and a mode in which a suite or raster of data are acquired to form an image cube. The remote sensing systems are used in the following way. FIDO is commanded to acquire Pancam data for use in characterizing the areas surrounding the rover. Selected targets are then covered with the IPS to obtain spectral reflectance data for mineralogical analyses. Once a target is selected, Navcam data are acquired and waypoints defined for the rover to traverse to get to the target (e.g., an outcrop of limestone). The rover uses on-board autonomous hazard avoidance systems, consisting of body-mounted stereo cameras and associated software, to examine terrain immediately in front of the rover. Obstacles judged too