There is a disc slot in the Nuvi 255w. On updating today, my Garmin had insufficient space for all of the European maps,
Amazon.com: Garmin nüvi 2597LMT 5-Inch Portable Bluetooth Vehicle GPS with Lifetime Maps and Traffic (Discontinued by Manufacturer) : Automotive
Garmin Nuvi 2597 vs Garmin Nuvi 3590LMT: What is the difference?
SD Memory Card Sizes for Automotive Devices | Garmin Customer Support
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SD Memory Card Sizes for Automotive Devices | Garmin Customer Support
nüvi 2597LM | Garmin
SD Memory Card Sizes for Automotive Devices | Garmin Customer Support
Garmin nuvi 2597LMT 5-Inch Bluetooth Portable Vehicle GPS with Lifetime Maps and Traffic (Discontinued by Manufacturer) : Amazon.ca: Electronics
32GB Micro SD Card For GARMIN Nuvi 2595LM, 2595LMT, 2597LM, 2597LMT SAT NAV | eBay