# GNSS Dead Reckoning -- Sensor Fusion Filter not necessary?

My question might be a bit off-topic but I don't know where else to ask.

When I do have a GNSS Module with integrated IMU and Dead Reckoning, for example, the Ublox ZED - F9K.

Does it still make sense to use a Filter for fusing GNSS and IMU / Odometry data or is that not necessary as the Module is handling that for me?

Or will the Dead Reckoning just enhance the precision after applying a Filter even more?

• Ah, let me google and see if I can answer you question. I first skimmed the following ZED-F9K Product Summary: u-blox.com/sites/default/files/… Sep 22 '20 at 2:09
• I also read the module product sheet from Sparkun and made a features summary: "GPS-RTK2 Board (ZED-F9P) Product Sheet - SparkFun": mouser.hk/new/sparkfun/sparkfun-gps-rtk2-board (1) TTFF = 25s (cold), 2s (hot); (2) Horizontal accuracy = 2.5m (without RTK), 10cm (with RTK); (3) Nag rate = 25Hz max Sep 22 '20 at 2:27

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