We have a new network service at google.psds.grapheneos.org providing a reverse proxy for the Predicted Satellite Data Service (PSDS) used by 6th generation Pixels to download GPS almanac data. Next release will add a toggle between the GrapheneOS (default) and standard services.
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They're rehosting the data from gllto.glpals.com on a simpler static file server at agnss.goog.
Qualcomm uses their own service for performing GPS almanac downloads. It's more difficult to make a toggle for their non-standard implementation but it's planned.
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It follows a configuration file and can have carrier-specific configurations so there's a way to make it dynamic. Even if there was only a hard-wired conf file, we could use a mount namespace to switch between 2 different configurations. Ideally it can be done in a simple way.