Install fishfinder on triumph 170 fish
SOURCE: Manual
Try Navman website here. http://www.navman.com/Navman/Templates/standardcontent____6268.aspx
SOURCE: repeated transponder issues with the lowrance 320c fishfinder
Reading the manual it does say that there is a temperature range for these. I"m not sure where you live but it might be cold enough that it is damaging the transducer in the off winter months.
SOURCE: When we are deep water
Im not familiar with your particular unit but you should be using a low frequency transducer for water over 500'; something like a 50 kHz transducer or a dual frequency transducer like a 50/200kHz for detail with the high freq. but increased depth range on the lower frequency. As far as setting it to 250 ft, you should be able to use the range feature and adjust the maximum to 250'. typically the factory default is automatic so it will caonstantly adjust the range based on the maximum current depth.
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