GTN 750 Xi ring with tick marks ~150 nm

[iamtheari]

On a recent flight, with the GTN 750 Xi zoomed out to show a 200-mile range ring, I saw another ring the meaning of which I don’t know. I didn’t see a reference to it in the manual. Does anyone know what this ring is showing me?

 

[NealRomeoGolf]

It's the regional boundary of the FIS-B nexrad depiction. Page 5-13.

 

[iamtheari]

It's the regional boundary of the FIS-B nexrad depiction. Page 5-13.

Thanks. And, will you look at that, the resolution of the nexrad data is higher within the circle.

 

[Martin Pauly]

It only shows that extra ring if you've configured the GTN to display a mix of regional and CONUS weather received from FIS-B.
If you select one or the other, it'll go away.

- Martin