HDS 10 Gen 2 Interface with LMS 525CDF

Can someone tell me if I can hook an HDS10 Gen 2 to a LMS 525cDF and mark the waypoints on both GPS receivers from the
HDS 10 thats on the console? The talk on the boards is that it can be done. I talked to a dealer and they said the nmea 2000
is not compatible with the HDS Gen 2. Ive allready got four GPS units and I'm tired of buying them just to get linked together. They say I will have to buy another HDS Unit! Anyone using a 525 or 339 lowrance or a garmin 172c with the hds 10 and saving way points? Thanks in abvance if you can help! Catch