There is a disc slot in the Nuvi 255w. On updating today, my Garmin had insufficient space for all of the European maps,
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How to Add a MicroSD Map to a Garmin Nuvi
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I have a Garmin nuvi 2460 which is a great nav system. We are visiting France in early july and I purchased a micro SD
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How to Add a MicroSD Map to a Garmin Nuvi
Support: Inserting a microSD™ Card on a Garmin DriveAssist™ - YouTube
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Garmin nuvi® 880 Portable car navigator with speech recognition and Bluetooth® at Crutchfield
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SD Memory Card Sizes for Automotive Devices | Garmin Customer Support
Garmin nüvi® 2200 Portable navigator at Crutchfield
How to Add a MicroSD Map to a Garmin Nuvi
