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).
Following fields are displayed for Helsinki, Southern Finland Monthly Yearly averages: 1  Max, Min and Average Temperature(Â°C/Â°F) 2  Visibility (km or miles) 3  Pressure (mb or inches) 4  Cloud 5  (%) Humidity 6  (%) Max and Avg Wind Speed (km/h, mph, knots or m/s) 7  Avg Wind Gust (km/h, mph, knots or m/s) 8  Fog Days.