New Garmin Policy concerning NüMaps Lifetime
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   15 years
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From Garmin:
nüMaps Lifetime
If you purchase a nüMaps Lifetime subscription (sold separately or bundled together with certain GPS models), you will receive up to 4 map data updates per year, when and as such updates are made available on Garmin’s website, for 1 compatible Garmin product. until your product’s useful life expires or Garmin no longer receives map data from its third party supplier, whichever is shorter. A product’s “useful life” means the period during which the product (a) has sufficient memory capacity and other required technical capabilities to utilize current map data and (b) is capable of operating as intended without major repairs. A product will be deemed to be out of service and its useful life to be ended if no updates have been downloaded for such product for a period of 24 months or more. Unless otherwise stated, the updates you receive under the subscription will be updates to the same geographic map data originally included with your Garmin product when originally purchased. In some instances, your Garmin product might not have sufficient memory remaining for you to load an update to the map data, in which case you will need to either (a) select reduced map data coverage for your updates, or (b) purchase separately a microSD™ card or a SD™ card (if and as applicable to your Garmin product) and load all or a portion of the map data coverage for your updates to the card and insert the card into the microSD card or SD card slot contained in your Garmin product. If neither of the measures in (a) or (b) can be used to address your product’s lack of sufficient remaining memory, then Garmin may conclude that the “useful life” of your product has expired. Garmin may terminate your nüMaps Lifetime subscription at any time if you violate any of the terms of this agreement or your subscription. Your nüMaps Lifetime subscription may not be transferred to another Garmin product.
The lifetime subsciption can be transferred to another person since it's now attached to the device itself 
:)
My old 255W which I seperately purchased nüMaps Lifetime subscription is attached to my unit. Yes it's registered but the FAQ states that if I delete my registration and give it to someone that person will beable to continue updating the maps since it's tied to the unit.
I hear you and hope your interpretation of the policy is correct and what Garmin Support told the other user is incorrect. Are you willing to test this by deleting the registration on your 255W and report back to us if the map update still works?
... I'm just teasing you, I don't expect you to take the chance with your nuvi. I suspect we will find out sooner or later from some user who tries it. 
Alan - Android Auto, DriveLuxe 51LMT-S, DriveLuxe 50LMTHD, Nuvi 3597LMTHD, Oregon 550T, Nuvi 855, Nuvi 755T, Lowrance Endura Sierra, Bosch Nyon