yep!
Been reading all those posts regarding 37>40 satellite reception accuracy problems
However my latest GPS unit came with hardware V11 instead of my original hardware V8
So followed Caty's guide & flashed 34xx on the nuvi with V11 hardware.

It upgraded the GPS firmware to 3.04.03 from 2.60
flashed with v8.20 software for the 34xx & it works flawlessly (no arrow jumping)

I'm interested to know if my Original nuvi with V8 hardware, v5.00 software could somehow have that single dashboard replaced for the glass semi transparent dashboard which allows more map viewing...
I don't mind experimenting now I have a backup device if anyone thinks It's doable