Bathy-500MF
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Bathy-500DF 
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Multi Frequency
Survey Echo
Sounder
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Dual Frequency
Hydrographic
Echo Sounder
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<click for more information>
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<click for more information>
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Any single frequency of:
33,40,50,200 or 210kHz
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Interleaved Dual Frequency of:
33/210kHz or 50/210kHz |
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or...any single frequency of:
33,40,50,200 or 210kHz
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