
Sonars are noticeably more expensive with map downloads, so the lack of a download can hardly be considered a disadvantage. In addition, there is not much trust in other people's cards, as individual, even large, stones are fixed on the screen, but will not be displayed in the final map. The echo sounder will "record" only the depths around the rocks. And the stones themselves need to be displayed manually with labels. Label names are inconvenient (cumbersome) to enter. Noticeably more confident "keeps depth" at a frequency of 200 kHz.




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