Richard:
We ferry aircraft all over the world and I have been using the Anywheremap for navigation ever since they put it on the market.
It is excellent and with a blue tooth antenna it is as stable as with a hardwired antenna.
We do not use the weather feature as it is not avaliable outside of the USA. However I would bet it is a very good system as anywheremap is state of the art.
And you also have a removable computer to use outside of the airplane....get a minimum of 512 meg card to load the info..one gig would be better.
Chuck