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).
The average temperature in Helsinki in September is quite mild at 11.5 Â°C (52.7 Â°F). Afternoons can be mild with average high temperatures reaching 15 Â°C (59 Â°F). Overnight temperatures are generally a little cool with an average low of 8 Â°C (46.4 Â°F). In September the range/ variation of daily mean temperatures is 7 Â°C (12.6 Â°F). The weather in September is somewhat dry with rain once in a while. Just 71mm (2.8in) of H2O descends during on average 15 days.