I’m interested in purchasing a GNSS RTK FACET device, but I’ve been reviewing the features of the RTK Mosaic L-Band and noticed that it has support throughout the United States. I’m a user based in Mexico and I need to know whether this functionality is available in my city. I’m located in Mexicali, a border city directly south of Calexico, with a direct crossing into the U.S. The furthest point in the city is about 30 km from the U.S. border. These are my coordinates X= 644,983.65 E, Y=3610467.00 Do you know if this service is supported in my region?
Contact U-blox to inquire about your specific situation, but just going off of their coverage map my first inclination is ‘no’ 
It’s obvious that coverage is not officially guaranteed in Mexico according to the maps that they show in the description, but as we know, the signal reach of satellite antennas and reference stations isn’t linear—it’s circular or rectangular. So, in order to guarantee full coverage across the United States, there must be a sort of “signal overspill,” so to speak. My question is: is that overspill large enough for me to reliably work with the system right at the border?
I found this image on GitHub — is it accurate?
I’d question the functionality of the Correction more than the delivery in this case.
Even if you receive the L-Band signal (which ya figure you surely can), the spacing of the ground stations will not be near the Southern edge of the service territory.
I’ve had “spotty” L-Band service while standing at the Gulf of Mexico/America.
Corrections were received and decoded, but a fixed solution was difficult.
As you move inland, it worked as expected.
I only have data in 1 general coastal location personally - so don’t take that as a definite answer.
That location is covered by (3) of the Blocks in your image, which I have no idea is accurate BTW :
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I can basically only account for what u-blox advertises…of course real-world performance/margins won’t be exactly matching, but it’ll likely be quite close. Your assumptions are mostly sound, but like rftop said we’ve seen some problems at the edges of the boundaries so it might work, but we will not be able to promise such (30km is also fairly considerable)
Is getting 2 RTK units units and using one as a base (instead of pointperfect/L-band) an option for your case?