I first looked at the Avmap a year or so ago when it came out.
It's made in Italy (avmap.it) who as reported above are sh1te when it comes to communications. They are somehow connected (owned by?) to a mapping out fit called Cmap who are equally sh1te. Getting questions answered is like getting blood out of a stone, and (as in the normal American style) they rarely answer those you actually asked.
In the USA, Cmap set up a dedicated marketing+support network for this product, which also distributes the updates (combined Cmap and Jepp data).
Sad to hear this crap support is still true over here.
Their route planner is crap - even certain of their resellers say that. But Navbox supports it now, and Navbox is the program of choice for Euro VFR flight planning.
The terrain elevations should be from the Jepp data so "should" be wrong on all aviation GPSs. I know of seriously (dangerously) defective elevations on the Honeywell KMD550 multifunction display and that product costs a few grand. One cannot rely on terrain colouring in aviation data to tell you how high to fly.
After a while I worked out how one does updates. They come from Cmap, and as far as I could find out they are not expensive. Also, the compactflash cartridge is unprotected (unlike the GNS430/KLN94 ones which are hacked) so you can reduce the cost of a current database with other owners
What Avmap shows is how crap the existing GPSs are, how little the buyers care so long as the unit is cheap, and how much better things could be done. They get close to doing something really good.