Found this, This was introduced to allow for the functionality of future sirius XM features and updates. No plans according to Garmin to no longer support GXM53 (although sometimes their MO) but GXM52 still works etc..
And this GXM 54 Weather Antenna & SiriusXM Marine Weather: $250 Mail-in Rebate August 13, 2019 Customers who own an existing GXM antenna and purchase a new GXM 54 from Aug. 13, 2019, through Nov. 13, 2019, are eligible to receive $150 via mail-in rebate when registering your rebate online at garmin.rebateaccess.com <https://garmin.rebateaccess.com/> . Limit 1 rebate per customer. The product must be purchased in factory-new condition. All submissions must be postmarked by Dec. 13, 2019. Qualifying existing GXM antennas include the following: GXM 51 GXM 52 GXM 53 This offer is subject to the terms and conditions set forth in the attached rebate coupon. You can also access the coupon online by visiting the following link: Garmin.com/rebates For any questions regarding this rebate, please contact reb...@garmin.com. This offer can be combined with the separate $100 USD SiriusXM Marine Weather rebate from SiriusXM. For more information about this rebate, please visit www.siriusxm.com/MarineRebate <https://siriusxmcommunications.com/sxmmarineoffer/marinerebate.html> . From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Pete Shelquist-comcast via CnC-List Sent: Friday, September 11, 2020 11:01 AM To: cnc-list@cnc-list.com Cc: Pete Shelquist-comcast Subject: Stus-List Garmin GXM This is very product specific; I'm considering an upgrade for my SiriusXM weather antenna from Garmin GXM 52 to the GXM 54. The hope is there's an improvement in download speed and resolution. Has anybody witnessed a comparison of these two? Thx Pete Get Outlook for iOS <https://aka.ms/o0ukef>
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