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XM antennas which are compatible with my legacy 400x or 500 series devices
The GXM31 is the only XM antenna that is compatible with legacy GPSMAP 400x and GPSMAP 500 series devices.
Please keep in mind, when using the GXM31 in conjunction with the GPSMAP 400x series devices, you will only be able to receive XM weather data. The XM radio feature is not compatible with the GPSMAP 400x series.
The same is not true for the GPSMAP 500 series devices. The GXM31 will provide both XM weather and XM radio when used in conjunction with the GPSMAP 500 series devices.