Hi I have no direct experience with this model but I'd suggest downloading the Lowrance GPS Data Manager (GDM)
Use a separate card to avoid overwriting any map data.
Edit to add:
Warning from the download page:Do NOT download if any version of MapCreate™ 6 is already installed.
So if you have MapCreate already installed it may be able to transfer the waypoints. Hopefully someone with direct experience with this unit will reply too.
Since this is basically a Lowrance question I'm moving it to that forum