1-Create a P25 trunking system
2-Create a "site" for each individual site near you. A minimum create 2 site for each of the 800mhz sites that Grand Island is licensed. Enter the control channels for the sites.
3-Create a group or groups you would like. Example GIPD, GIFD, NSP, and ROC/Statewide.
4-Program the talk groups to the group or groups you want to listen too.
I would highly suggest using programming software. It is a lot of work to program trunking systems via the front panel.