[gps-talkusers] wishes

Dear List,
, was wondering what do the swishes mean when you are either calculating a route or searching for a POI. Also when you hear these swishes, on the Braille display you will get a number starting from 1, changing every 3 second, and finally stopping at a particular number. I was wondering what is the purpose of both the swishes and counting on the Braille display. Is it suppose to represent the progress, if so how does one know roughly at what percent they are currently at?
Thanks,
Kevin


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