Connecting Serial Garmin GPS to iMac Intel

I was wondering if anyone has connected a Serial port cable GPS from Garmin to an iMac Intel using a USB to RS232 converter cable. I have a GPSmap 76S from Garmin and have not been able to get Google Earth or LoadmyTrack programs recognize the GPS. I have created a serial port through Bluetooth and downloaded a program from Keyspan ¨Serial Assistant¨, the program recognized the cable adaptor but not the GPS on the device list. Would appreciate any feed back on the subject. I contacted Garmin and they said that they do not have any experience with Apple computer at the moment and the compatibility. I contacted the company who made LoadmyTrack and they said they have had success connecting the particular model GPS with Apple computers but did not specify if they were the intel duo core and have not heard from them again.

I have a Garmin 12XL (very old serial connected GPS) and use MacGPS Pro software (terrific software, terrific support from the author! - http://www.macgpspro.com/). When I moved from my beige G3 desktop to my iMac, I worried about this but their recommendation was painless. I bought the Keyspan USA-28X usb to serial adapter (This is a dual mini-din to usb adapter, which I chose because my existing cabling fit the min-din serial ports on my G3 - but Keyspan's USA-19HS is also available for PC type serial cables). Keyspan offers a Universal Binary driver to support this. (I am using the Keyspan Serial Assistant as you are.) The MacGPS Pro software is also Univeral Binary, and I have no trouble getting the GPS info into my machine this way. Haven't tried getting GPS info directly into Google Earth though... Something else to play with later, I guess - I see the MacGPS Pro software now supports interaction with Google Earth.
Just a quick revision here... I see the GPSMap 76CS uses a different connector than mine - not sure about your GPSMap 76S - but the proper Keyspan device MAY be the "Garmin 010-10141-00 with
Keyspan USA-19HS" suggested on the web site I noted above.

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