As it's just a for a sat nag just about any cheapo smart phone will do and the modern apps are really very good, it doesn't even need a sim card in it, look in your local phone shop, or cash converters etc, even Ebay.
I do have a Garmin too "somewhere" but I bet it's older than Barrys, it's aique3600, I had it listed on eBay and it didn't sell so o idea where I put it.
As an idea of cost for a phone which will do the job. also handy as you can use them to walk around a town and find you way back to the car/van
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