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).
In northern Finland winters are long and very cold, while summers are surprisingly warm, but brief. In the southern areas of Finland winter temperatures are milder, but still cold, while summer days (May through September) can be downright pleasant. Winter days there are dark and rather eerie as the sun never rises for almost two months. Further south in Finland summer days are longer with lingering evening light. In winter the sun seems to just creep above the horizon; days are short, and available light is muted and less intense. In winter, Finland (north to south) is covered by a blanket of snow.