Tools

The map toolbars - one tool per button, each opening a mode, popup or dropdown.

Tool	Icon	Does
Calculate		Runs the calculation for the current selection now. Works for networks and nodes.
Clear		Sweeps calculated results off the map, leaving the radios in place.
Add Radio		Disabled until the account has at least one template; toggles add-radio map mode, click the map to drop a radio using the selected template's settings.
Add Path Profile		Enabled only when a radio is selected; toggles add-link mode.
Search		Opens the search popup - places worldwide, plus the project's own networks, radios and path profiles.
Map Settings		Opens map settings.

Header Icons

A handful of icons live at the far end of the header rather than on the toolbar - some reporting status, some opening something:

Icon	Does
Sync	Whether project changes have saved to the server. It turns while something is saving or calculating, and goes red if the last save failed.
Tile	Whether map tiles are still loading, filling as they arrive. Absent once they are in.
Notifications	Recent system and calculation notifications. Appears only once there are any, and colours orange or red for an unread warning or error.
Help	Opens this documentation site in a new tab.
Account	The signed-in account, with a menu to switch or sign out.
About	App version and links to support.