APRS.fi is introducing new symbol graphics and better support for mobile devices
The new symbols are drawn in vector format (as opposed to a raster format at a fixed resolution), allowing them to be rendered at larger and smaller sizes without distortion or blurriness. The new symbols are slightly larger than the old ones, making them easier to recognise on modern displays having smaller pixels than the old ones. They're also available in double resolution so that they're properly sharp on the 4K/retina displays found on many modern tablets, phones and computers!
One downside is that they are just a little bit bigger than the old ones, taking up more space on the screen. On the other hand, the old ones were a bit too small on modern displays, and the very small resolution did make it hard to understand what the symbol tried to mimic.
Read the APRS.fi blog - http://blog.aprs.fi/2015/11/new-symbol-graphics-and-better-support.html
Beta site - http://beta.aprs.fi/
Amateur radio Automatic Packet Reporting System (APRS) - http://www.aprs.org/
APRS UK Yahoo Group - https://groups.yahoo.com/group/APRSUK