Apple Watch 7 mobile gps is compatible with operators in Brazil?

Assuming you mean if the U.S. Apple Watch is compatible with Brazilian carriers, then no. Brazil uses a different model than the U.S. A U.S. Apple Watch will not work with Brazilian operators.

See here: Apple Watch - Carriers - Apple

Not in the U.S. Apple does not sell models that will not work in the country they are sold in. You would have to travel to a country that sold the same model as Brazil, assume there were no additional country specific feature restrictions that would impact you use in Brazil

There are 2 Apple Watch cellular radios

• Canada, U.S. Mexico, Puerto Rico

• The rest of the world

Carriers will not attempt to connect to an Apple Watch that does not use the correct radio.

If you do not get your Apple Watch in your own country, you may have to return the Apple Watch to the country where purchased to get warranty service.

If you do not get your Apple Watch in your own country, there may be country specific restrictions in the installed Apple Watch software that prevent features from working when you get home.

watchOS - Feature Availability - Apple

NOTE: The GPS only Apple Watch will work anywhere your iPhone works, and can do Everything the Cellular model can do AS LONG AS your iPhone is nearby, where nearby is generally somewhere in the same moderately sized home. The Cellular model allows you to leave your iPhone at home while you go for a walk, run, bike ride.

Use your Apple Watch without your iPhone nearby - Apple Support

The GPS only model will work anywhere in the world. Do note, it has no ties to a cellular operator and will not receive calls or messages when away from the paired iPhone or Wi-Fi.

If you intend to use the watch in Brazil, buy it in Brazil.

A GPS only Apple Watch works anywhere your iPhone works.

But check the features of where you purchase the Apple Watch against the Brazil restrictions as the country of origin restrictions will apply

watchOS - Feature Availability - Apple

And Warranty issues may also apply, as Warranty is country specific.