The HF radar is a shore-based radar covering a wide range of the sea surface and mainly monitoring surface waves and currents of the ocean providing in high spatiotemporal resolution data. In any case, HF radar is a low cost instrument not only by the maintenance but also by the operation.

Tide gauge is an oceanographic instrument measuring changes of the sea level. Changes of the sea level play an important role in our environment changes especially at the coastal zone. Tide gauges are an important tool in order to determine trends in mean sea level and extreme conditions, which are linked to the climate change, tidal computation, geodetic applications, harbour operations and navigation. Thus, continuous monitoring of sea level changes is necessary.