The GT-87 from FURUNO Electric Co., Ltd. is a GNSS Module with Frequency 1575.42 to 1602 MHz, Tracking Sensitivity -161 to -157 dBm, Cold Start Sensitivity -147 dBm, Acquisition Sensitivity -161 to -157 dBm, Cold Start 40 S. Tags: Surface Mount, Module. More details for GT-87 can be seen below.