System Diagrams draw a NIRSC-style picture from the kits on the incident so you can brief how command, hubs, aircraft links, and remotes hang together without redrawing it by hand. You only see this module when it is turned on.

Sheets follow the usual split: command and a UHF hub (and crossband) on one page, aircraft links and remotes on others. Field boxes are two columns — red for the repeater side, blue for the link — with notes across the bottom. Lightning bolts in the legend are blue for UHF and red for VHF. Kit identity uses the FCK labels people already know from the cache paperwork.

Links are inferred from complementary frequencies: a command link toward a hub repeater on UHF, a remote toward command on VHF, crossband toward command. Titles say whether you are looking at a hub or UHF simplex. A kit may appear on more than one sheet when it is needed as context. Export PDF or print in landscape, or take a spreadsheet. Safari sometimes inserts a blank page between sheets; that is the browser, not your topology.