The FlowTracker part of the test was not too bad. For ADCPs I prefer beam alignment test (distance made good tests).
We had five FTs mounted with wading rods on a ladder. The boat speed was stable using an electric engine with fixed speed posistions. To compare the velocities we drove straight for 300s four times at different speeds.
Compared velocity magnitude since all FTs can’t be oriented perfectly. Vel_magnitude = sqrt ( vel_x^2 + vel_y ^2)