Dilek provided the direct answer, but I thought I would add a couple of additional comments ... if readers don't mind.
First, most often when people ask about a "Beach Mode" we presume they are referring to a detector being used on a Salt Water beach. The circuitry design of the Impact's COG or Beach mode is to provide added control of the very low-conductive issues with wetted salts. Most better designed detectors, like ALL of the Makro Racer and Racer 2 units and the Nokta FORS CoRe, FORS Relic and new Impact, have that function.
Note that the Beach or COG mode is not needed when hunting a Fresh-Water beach such as a river, stream, lake or other impounded salt-free water body. Those searches can be accomplished using any of the All Metal modes or any of the Discriminate modes other than COG. Also note that the COG mode can sometimes be useful when away from salt water beaches, but when dealing with well wetted alkaline soils as the salt content can be 'brought to life' when it gets reasonably wet saturated. This just adds to the flexibility of having the COG mode on a versatile, all-purpose detector.
Monte
First, most often when people ask about a "Beach Mode" we presume they are referring to a detector being used on a Salt Water beach. The circuitry design of the Impact's COG or Beach mode is to provide added control of the very low-conductive issues with wetted salts. Most better designed detectors, like ALL of the Makro Racer and Racer 2 units and the Nokta FORS CoRe, FORS Relic and new Impact, have that function.
Note that the Beach or COG mode is not needed when hunting a Fresh-Water beach such as a river, stream, lake or other impounded salt-free water body. Those searches can be accomplished using any of the All Metal modes or any of the Discriminate modes other than COG. Also note that the COG mode can sometimes be useful when away from salt water beaches, but when dealing with well wetted alkaline soils as the salt content can be 'brought to life' when it gets reasonably wet saturated. This just adds to the flexibility of having the COG mode on a versatile, all-purpose detector.
Monte