Fig. 4

The model estimates for the static tests including their confidence intervals for A the number of satellites LMM model with 17 as reference level (intercept), B the HDOP value GLMM model with 0.65 as reference level (intercept), C the static GPS precision error GLMM model with 3.872 as reference level (intercept) and D the static GPS accuracy error GLMM model with 4.715 as reference level (intercept). The models included scaled numerical explanatory variables (sc), station as random effect, and the GLMM models were modeled on a gamma distribution with a log-link and their estimates were back transformed to the original scale. Purple suggests a negative effect and green a positive effect. Furthermore, abrogated stars indicate the strength of evidence