Ublox press release featuring Ardupilot and Here+ RTK GPS

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Nice press release from premier Swiss based GPS manufacturer ublox, promoting Ardupilot, HEX Taiwan, and the Here+ RTK solution. Designed by ProfiCNC and Ardupilot development team member and hardware lead Philip Rowse, the high precision Here+ RTK GPS integrates the ublox’ NEO M8P GNSS module.

HEX Taiwan announces drone navigation kit with u blox high precision RTK GNSS module

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how to activate the imu unit of this rtk ? how good to use the RTK fitted imu during flight instead of using pixhawk’s imu ? Can we use both in a flight ? If i will use the RTK’s imu, what will be effect of this on the accuracy ?