Can I use my Garmin GPS antenna with my Raytheon Plotter?

[emoney]

First of all, I've searched.....and searched.....and then searched again, so if I've overlooked this question, please forgive me and point me in the right direction. Now, on with the show;

Being rather on the "frugal" side, I'd prefer to use and then reuse what I already own. I picked up a Raytheon Raychart 420 plotter the other day, and I need an antenna for same. I have a Garmin GA29 and I'm wondering if there's a way to splice into it and configure the wiring for the 420? I already happen to have a plug for the 420, complete with a wiring diagram to allow for connection to a Raymarine 125 receiver, but I'd like to avoid that $300.00 price tag if at all possible and since the look the same on the outside. Are there other alternatives if the Garmin doesn't work? I guess the 125 is so costly because it's both an antenna and a receiver, but I don't believe my old 420 needs the receiver part, so why pay for it, right?

[smurphny]

I have a Garmin chartplotter and a small Garmin handheld. Both will work as GPS receivers when wired into computers using plotting software such as Sailcruiser, Open CPN, and Sea Clear. I think the GPS signal is standard and probably will work with the right connectors. Your plotter probably has a selection screen for the type signal. If I remember, I have to make sure it is on the Garmin USB protocol in Sailcruiser. Hope that helps.