Download Brochure. The HydroBox HD TM is a portable high- resolution, shallow water echo sounder. Designed for inshore and coastal hydrographic marine surveys up to 1000 meters of water depth. Extreme ease of use, portability, and cost efficiency make this device the perfect choice for shallow water hydrography.
Guide to Helsinki weather in May The average maximum daytime temperature in Helsinki in May is a comfortable 15Â°C (59Â°F). The average night-time temperature is usually a cold 5Â°C (41Â°F).
Note that Finland's weather is not as cold as many think - the Finnish average mean temperatures are higher than that of other regions in the same latitudes (i.e. south Greenland). The temperature is raised mainly by warm airflows from the Atlantic, and also by the Baltic Sea.