Are you genuinely unaware of age-related presbyopia? You'll find, fredaroony, that come 50 years old, your arms will become too short to read the small print. I'm 60 and for the past ten years have needed reading glasses to see my instruments clearly - my solution is a pair of Designoptics sunglasses with a reading insert so I can glance down at in-focus maps / dials, or up through clear glass for distance vision. At night I just perch my clear reading glasses on the end of my nose. This works equally well in my airliner as it does on my bike.
Anyway, back on topic. My GSA's Nav V has a digital speed readout below the map which turns red if you exceed the speed limit (and is generally more accurate than the bike's analogue speedo, albeit with some lag in updating).
Also, in all the chat about trying to avoid falling foul of speed cameras, I'm surprised no-one mentioned setting cruise control, which is great for ensuring you don't inadvertently creep above 30 or 40.