This case does the job,
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This review is from: HDE Universal Protective Travel Hard Case for Small Electronics and Accessories - Power Banks, Portable Hard Drives, GPS Units, Nintendo DS 3DS and more (Black) (Electronics)
This case fits the Garmin 5" perfectly. I holds the charge cord in a nice netted area so it doesn't hit against the unit itself. It also doesn't take up too much space so it fits in the center console of my Kia Optima as expected.