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).
Northernmost Finland is above the Arctic Circle, so the sun does not rise for a month or more during the winter. Itâs not completely dark â there are a few hours of twilight around noon. This polar night is called âkaamosâ in Finnish; it sounds a bit like âcalm usâ.