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).
Over the course of September in Helsinki, the length of the day is very rapidly decreasing. From the start to the end of the month, the length of the day decreases by 2 hours, 37 minutes, implying an average daily decrease of 5 minutes, 25 seconds, and weekly decrease of 37 minutes, 57 seconds.