Pro Subscribers can access and download custom symbol sets for Fire purposes using the links below.
EMSINA All Hazard Symbols can be found here
NWCG STOP Fire Symbols can be found here
To import these symbols into the app, you will need version 3.4 and a valid Pro Subscription. To import the symbols, please open the app and go to Settings > Manage Symbol Sets > Import > navigate to the file, or enter the link above.