GPS RTK capable receiver based on Ublox Lea-4T 

Can run in  RTK mode using RTKlib freely available software, using the Raw data ouput.

Two units required for full RTK mode unless Alternative base stations available (eg NTRIP)

These units run in L1 mode and will get a reasonable RTK fix typically realtime 20cms RMS but do not confuse with L1 +L2 RTK receivers which can get down to cm accuracy.

Bare board version ( this one) and encased version ( add £30), see sellers other listings. 

Serial I/O at logic levels ( this one) or see sellers other units for usb plus serial I/O ( extra £35)

Timing output also available.

This is a receiver only, requires antenna and cable also available.

5volt power required.

Unlimited fair use help getting set up with RTKlib

BACS payment ( preferred) or Paypal