The GT-86 has a TTFF time at Hot start of less than 5 seconds, Warm start of 35 seconds, and Cold start of 40 seconds, and can operate between -40°C to 85°C, while only consuming 68mA of power in Acquisition mode. The GT-87 has a TTFF time at Hot start of less than 5 seconds, Warm start of 35 seconds, and Cold start of 40 seconds, and can operate between -40°C to 85°C, while only consuming 72mA of power in Acquisition mode.