The high cost of modern GNSS (Global Navigation Satellite System) receiver and their post processing software present an obstacle in the surveyed laboratories for poor countries. This study aim is to investigate the possibility to used low cost GNSS receiver in the place of those costly one, by appreciating the time of processing data and the coordinates to converge under 50 seconds, then model the errors between those two instruments before evaluating their accuracy. The materials used were the one of reading, and observation of data, the order for the processing of data. The method consisted to carry out data by the static PPP (Precise Point Positioning) and the dynamic method (Kinematic PPP) and PPK (Post Processed Kinematic) of 10 benchmarks SEPRET (Société d’Etude des Projets et de Réalisations des Travaux) pilars through two multiband GNSS receivers Emlid Reach RS2. The results shows that the differences between the readings data in static PPP, PPK and kinematic PPP mode is small and they are respectively within the ranges [20.3cm-24cm], [7.5cm-30.4cm] and [-9.3cm-22.8cm] along the X-axis, [17.8cm-22cm], [14.8cm25.2cm] and [11.4cm-29cm] along the Y-axis and [5.3cm-6.1cm], [-16.5cm-0.8cm] and [-55.2cm-9.6cm] along the Z-axis which are around the centimetre. Then the error model per axis is β$_1x^6$ + β$_2x^5$ + β$_3x^4$ + β$_4x^3$ + β$_5x^2$ + β$_6x$ + β$_1$ and the accuracy model is a linear function W(x) = Ax+B showing the very closeness coordinates values between the two types of instruments