Humminbird waypoint transfer question

I have 2 HB that have some of the same waypoints in them. The question is if I transfer the waypoints on SD card and some of the same waypoints are already on it will it double copy or what. Will I have to go through and delete the doubles or what would I need to do.

Thanks for any help on this in advance.

If there is a waypoint on the SD card that you have loaded into the unit - and you edited that waypoint before exporting the waypoint back to the SD card = yes it will duplicate it ...

Otherwise only new waypoints created will be exported to the SD card ...

Rickie

Thanks Rickie.