Not my application, yoyoek1 is a VERY talented developer who has written a navigation application - yosmapa and it is available in extra-devel repository.
I have been using it since the first version and it seems very stable and full of functionality.
The best thing is (for me anyway) that the developer is adding functionality on a daily basis and is very open to suggestions for further improvements.
It is based on plug-ins and so far has the following features:
Multiple map sources
POIs
Send current location by SMS (sends a link to google maps web page of your location)
Voice navigation using espeak (with or without spoken street names)
Automatic recalculation of route if you miss a turn (selectable distance before recalculating)
Time to arrival and average speed stats
One click to call from Google places
Search for places as well as addresses
Navigate by driving, bicycle or walking
Save/load GPX
Please give it a try and let me know your feedback/suggestions, I will keep the tracker updated with reported bugs and feature requests.
I did see that thread, that's where I found the app but I felt that the product was better suited to the applications forum where the other navigation apps are, rather than the development forum. more people seem to visit this forum and I wanted them to know about yosmapa!