I download the waypoints to my computer , then burn them to a new card for the new unit.
It is comforting to have the points backed up on a pc.
I need to do this soon as I have added lots of points lately
For the units to recognize GPS data, it has to be in the MATRIX folder that the unit creates when you EXPORT to a memory card.
HumminbirdPC also creates the MATRIX folder when data is copied from the software to a memory card.
If data is not in the MATRIX folder the units will not recognize it.
When you want some of the waypoints EXPORTED to the memory card, under OPTIONS, you choose Select Mulitple and...
Then select EXPORT, then select which ones.
To load the data to the other unit, you FULLY start it up in SIMULATOR or NORMAL, then insert the card and upload.