  We have added the BeppoSAX Gamma-Ray Burst Monitor to the 3rd Interplanetary
Network of burst detectors. We analyze 16 bursts whose positions are known to
good accuracy from measurements at other wavelengths. We show that there is
excellent agreement between the Ulysses/BeppoSAX triangulation annuli and the
known positions of these events, and that these annuli can in many cases
provide useful constraints on the positions of bursts detected by the BeppoSAX
Wide Field Camera and Narrow Field Instruments.
