Low-frequency profilers are therefore used when a large range is necessary, i.e. in the deep ocean. On the other hand, high frequency profilers are more frequently used in coastal areas, when high spatial and temporary resolutions are useful. Likewise, the higher the frequency of profilers, the smaller the uncertainty of speed measurements, as their short-term variability is reduced. The reduction in measurement uncertainty is made to the detriment of the range, as high frequencies are significantly better absorbed by the medium (see Table 2.6).