NavigX for iPhone (formerly NavigX Touch) was the world's first iPhone app to take a Latitude and Longitude and convert it to an Ordnance Survey Grid Reference.  Now at version 2.3, NavigX for iPhone now packs more features into the app than ever before.

Building on the success of the original, NavigX for iPhone 2.3 now converts between Latitude/Longitude coordinates and Ordnance Survey Grid References (Great Britain and Ireland), Military Grid Reference System (MGRS), United States National Grid (USNG), Universal Transverse Mercator (UTM) and Global Area Reference System (GARS) coordinates, all via a vastly updated user interface which fully utilises the capabilities of the iPhone.

As with the original version, NavigX for iPhone 2.3 still gives you your location but now you can choose how you'd like to see your current location - any of the available grid reference styles are selectable.

The similarity ends there, though. Navigation is also included in NavigX for iPhone 2.3 and you'll find a wealth of features that you'd normally only find on a high-end GPS. Magnetic/True heading (on the 3GS and 4), Bearing to your destination, course/track, magnetic variation, altitude/elevation, distance to destination, average speed, current speed, waypoint directory and track history are just a few of the features you'll find. For the more experienced navigators, you'll find that you can also select between Great Circle or Rhumb Line navigation methods.

No GPS can cut the mustard these days without a map and NavigX for iPhone 2.3 has just that. Integration with Google Maps is now part and parcel with NavigX for iPhone and you'll find maps in pretty much every part of the software. You can even add waypoints to the waypoint directory from a map-based display.

And the features don't end there. NavigX for iPhone is the only app on the iPhone which can give you your location AND help you get rescued should something go badly wrong. SOS Messaging is another world first and its purpose is to ensure that you get your position, in your currently selected format, to someone in your address book when you need someone to know the most.

NavigX for iPhone 2.3 is now available through the App Store and is still only £1.79 ($2.99). That's still less than the price of a beer for a very capable GPS system.

For up to date information and news as well as discussion of NavigX for iPhone, you can follow us on Twitter @navigxdude.