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Position the unit in open ground with a clear view of the sky over both the survey area and the takeoff point.
The M4E's three cameras are fixed to the airframe, there's no bay to swap a different sensor in.
Known coordinates and averaged in FIX both produce a base position accurate to survey control.
Setting up a D-RTK 3 as a base station is a one-time job; using it well on an actual survey or mapping site is a different skill, reading the correction status during a flight, knowing when FIX has genuinely dropped out rather than just fluctuating, and understanding what limits how many aircraft it…
An Emlid Reach receiver serves two separate functions on a DJI mapping job. As a base station, it broadcasts RTCM3 corrections over NTRIP to the aircraft's RTK module, giving it a local correction source independent of network coverage.
Every row above the camera line reads the same. The positioning engine did not change between the two models; the housing added two lenses.
Positioning accuracy is identical on paper. Both receivers hit the same 7mm + 1ppm horizontal figure once a fix is locked, so the decision comes down to how reliably each one gets there and what role you need it to play on site.
For the technical detail behind these figures across the full range, read Emlid GNSS Receivers Explained.
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