D3048180A.JCV is not meant for full-screen display, it's images have a picture size of 212x234 pixels and it's meant for split-screen display in 2/3xxx devices. 1xxx normally uses 480x270 jcv images and can only display in full so it horizontally stretches the split-screen image signage to fit, also resulting in loss of the view's resolution as seen in your sample images. The non-U map with D2504180A.JCV or D3084150A.JCV is the correct combination to use but the larger file's nearly 664MiB in size. D3048180A split is only ~379MiB but regardless possibly has slightly more views than D2504180A full and many, many more views than D3084150A full at ~312MiB.
Additionally, in spite of some claims to the contrary, imo 1xxx is not completely compatible with Unicode maps. However it certainly has less issues in actual use than earlier nuvi series 2xx and 7xx for example. If you wish to save some space on the unit or microSD and don't mind the 'stretched and fuzzy' look of the 212x234 JCV you will probably not have many problems in actual use with the EUU map depending on language usage, locations used and searches made.
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