These values are estimated values and "9" is an average for "average" soils. This value has a direct impact in the depth information of the unit. The lower this value is the faster the signal travels so to speak and the more you see with the same time interval. So, yes, you should adjust this to your type of soil. You can do that in three ways, by estimating the soil, by calibrating the unit with a known depth object or by using hyperbola fitting tool. Regards,
_________________ Reinaldo Alvarez Cabrera Geoscanners AB Sweden http://www.geoscanners.com
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