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).
During January and February, there is almost always snow in northern and eastern Finland. Even if thereâs little snow in Helsinki, thereâs often up to a metre or more on the skiing slopes of Lapland. The snow season in northern Finland begins in November and lasts at least until May.