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Old 11-06-2019, 09:26   #1
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Halifax Sailor's Avatar

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Join Date: Nov 2014
Location: Halifax Nova Scotia
Boat: Mirage 27
Posts: 162
Standard Horizon GX1270s

Looking for some help, prob know the answer as i have been running into walls. Picked up a SH vhf radio model GX1270s at our club yard sale. PO thought he'd only put in mmsi number once (radio allows 2 tries). Apparently the mmsi was input twice as it will not allow me to reset. Googled and found the following hack:

On the GX1260S (and I assume the very-similar GX1270S), remove a three-screw cover plate on the rear of the radio. With power off, move the small jumper to connect the bottom two pins. Power on while pressing Call/Set. MMSI is reset. Power off, return the jumper to its original position and replace the cover.

Sounded great but in real life didn't work. So i am reaching out to the forum if anyone has a hack or has heard of successful hack to reset mmsi on this model. Have contacted SH and they do not support this model any longer and do not have the software available to do so. Even tried to trade my new number with original owner if he could reset his new gear, unfortunately no go there (I don't blame him as once you are set up why take the chance).

Not looking for trade secrets, just wanted to make my family and boat a little safer at a much less expensive cost. Anyone????
"When i grow up I want to be a sailor, my wife tells me i can't do both"
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Old 11-06-2019, 10:15   #2
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Join Date: Jan 2019
Location: Oceanside Ca
Boat: Lancer 27PS
Posts: 110
Re: Standard Horizon GX1270s

If that MMSI was issued by BoatUS, you can contact them to cancel the original owner and assign the MMSI to you.

Other than that, it is now just a paper weight and you will have to buy a new radio, put in a MMSI and make that radio a paper weight.

One other option, if an option at all, is sit down with the original owner and have him contact the issuing authority and change the contact information.
Brian D
S/V Takara
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