There are no specific frequencies for digital simplex but there are "recommended" frequencies. For 2 Meters 145.670 is recommended for use with D-STAR. For C4FM the recommended frequency is 145.5625 so you will need to set your radio to the 12.5 KHz step.
System Fusion radios have a feature called GM or Group Monitoring. The GM function automatically monitors the frequency for any other station with the GM function turned on. If another station is received operating in GM your radio will then display the other stations callsign and if GPS is enabled on both radios then the acquired distance and direction will be displayed on the radio.
The GM function is also very popular on the 10 Meter band and during the Sporadic-E season also on 6 Meters. The 10 Meter frequency is 29.250 and the 6 Meter frequency is 51.500.
