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GPS City Q&A » Antennas » Difference between the GXM 30, 30A and 40?

Antennas (9 replies)

Item

Original Question

Difference between the GXM 30, 30A and 40?

› Garmin GXM 30 XM Smart Antenna

Author

Reply

Reg Ney
Homosassa, FL

Original question asked on Sep 12, 2010, 1:30pm

What is the difference between the GXM 30, 30A and 40, besides price? I have a GPSmap 478 that I want to purchase an antenna for.

Thanks, in advance, for your answer.

Jordan GPS City
Calgary, AB

Reply #1 on Sep 13, 2010, 10:04am

Hello Reg,

The compatible XM radio for your GPSMap 478 is the GXM30.

The GXM30A is for aviation units and the GXM 40 is for newer units. Your unit is not listed on Garmins site as being compatible with the GXM-40.

Cheers

Russ
Abbotsford

Reply #2 on Feb 4, 2011, 8:30am

I had this same question, according to Garmin's firmware upgrade 4.10, the GXM 40 is compatible:

Changes made from version 3.90 to 4.10:

* Improved XM weather data map display algorithm
* Added support for GXM 40 antenna
* Improved battery gauge accuracy

Russ
Abbotsford

Reply #3 on Feb 4, 2011, 8:32am

Just to clarify, that's firmware upgrade 4.10 for the GPSMap 478 in the above post.

GPS City Ben
Las Vegas, NV

Reply #4 on Feb 4, 2011, 9:23am

Thanks for the info, Russ! Much appreciated!

Stephen Dick
Ottawa, Ontario, Canada

Reply #5 on Aug 26, 2011, 2:15pm

I have a Zumo 550 of which this antenna is listed as the one to receive weather info. If this antenna (GXM 30 or 30A) is discontinued, is there a replacement for it? Thx

GPS City
Calgary, AB

Reply #6 on Aug 26, 2011, 2:19pm

the GXM30

Diana
San Francisco

Reply #7 on Oct 24, 2011, 7:33am

I too have a Garmin Zumo 550 & want to subscribe to XM Radio. Which antenna do you recommend the GXM 30 or 40?

Roxie - GPS City
Calgary, AB

Reply #8 on Oct 24, 2011, 7:40am

The GXM 30 is the only XM antenna compatible with the Zumo 550, but as it has been discontinued we as a retailer are unable to obtain them anymore. Your best bet would be to find one through consignment websites like eBay, Kijiji or Craigslist.

Gary
Newmarket

Reply #9 on Oct 24, 2011, 10:19am

GMX30 Antenna for sale. I have just upgraded to a Zumo 665. If your interested contact me at g.worters@gmail.com I live in Ontario, Canada

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