gtn750

Anyone know what this yellow ring on the 750 means? The only reference in the manual I could find was a TFR, but it also seems to include a time-indicator. Maybe the TFR starts in one minute? Any ideas?

Looking at an upgrade from legacy equipment in a corporate a/c that fly's throughout North America. Our options are for a Dual GTN 750 setup or a GTN 750/650 pairing. I'd jump with both feet on the dual 750 install but there is a 'real estate' crunch. It can be made to work w/ some changes to...