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Not sure from Garmin to Raymarine, but in the past we have downloaded the #'s to a card like a chart card and uploaded it in to the new machine. Make sure the card is compatible to both units.
Chris,
Where abouts are you located? I have a friend who does this exact thing here in NC. His name is John McWhite and runs a business called Profinder Charts. He can take waypoints from almost any machine and transfer them to your new one. His number is 910-512-6700. Tell him that "Squid" sent you and he will take great care of you!