As the new uBlox Zed-F9P GPS is starting to become available I thought it would be worthwhile to do some side by side testing with the previous generation uBlox M8P. This testing is without external corrections, so both GPS modules are running as standalone GPS units.The key change with the F9P is that it is dual-band when paired with a dual-band antenna. That allows is to estimate ionospheric corrections much more accurately than can be done with a single band GPS module like the M8P.
Source: Comparing a uBlox Zed-F9P GPS with a M8P without external corrections – Blog – ArduPilot Discourse
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