I think it is important to get the waypoints into Humminbird PC first....and then let HB PC put them onto the SD card before putting the SD card into the unit..there are probably some write data that HB PC puts on the card along with the waypoint data so that the unit can properly upload the data...
See if this helps...
How do I convert competitor's waypoints to Humminbird format?
Some are using this converter...(if the files are not in a format that HB PC recognizes)..
GPSBabel: convert, upload, download data from GPS and Map programs
Rickie


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