A recent discovery of mine is the ability to add additional POI’s (Points of Interest) to in-car navigation systems. Initially was sceptical about the usefulness of this, until I found some community sites which allow you to download pre made POI files. There is a huge variety available based on Country, Category or both.
The most useful site was the GPS POI Data Directory http://www.gps-data-team.com/poi/, used this to add a Safety POI’s which included Speed Camera locations to the already preloaded POI’s in the navigation system. This site also had icon files and instructions showing the correct installation method and settings for most navigation systems.