malfunzionamento gps

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ciao ho da da poco comprato un sensore gps (in particolare il vk2828u7g5lf) ho scaricato tutte le librerie necessarie e riesco ad avere informazioni corrette su latitudine e longitudine ma nessun valore relativo l'altitudine e il numero di satelliti.
cosa potrebbe essere?
grazie

dipende da quale sentenza nmea leggi e/o il gps invia, non tutte contengono il numero di satelliti.


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