The above got me interested. I assume you're using this map and the jcv file in your DNX7230DAB. The Kenwoods usually use the same ancillary files as 34xx/35xx which means using the split-screen 212*234 picture size jcv which of course isn't available to this non-unicode map.
You're saying quite plainly that the 480*270 is displaying in the KW as a splitscreen view as exampled by the lower pic from the internet. Could you be more specific as to how it's showing? i.e. is it shrunk proportionally to display the entire image, or is the image cropped back? e.g.:
(1) [Only registered and activated users can see links. ] or (2) [Only registered and activated users can see links. ]
The above are 212*234 (1) shrunk and (2) cropped proportional representations of this full screen 480*270 image from EU 2015.20:
[Only registered and activated users can see links. ] [Only registered and activated users can see links. ]
My experience with a nuvi 3590 loaded with non-U EU and full screen 480*270 jcv result in this (simulating a route on M6 to Manchester in UK):
[Only registered and activated users can see links. ] However, the unit gets a little confused when scrolling thru the route because when it shows the immediate next jc view it shows as split screen, but then subsequent upcoming views on scrolling show full screen:
First this:Then this:
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Then this:

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