Does such a thing exist?

I have a java enabled phone, is there a java based system that I could use, obviously connecting via an external bluetooth sat nav?

Gps for Java engine does exist:

[Please Register or Login to download file] is a mobile application, similar in some ways to Google Maps, but providing different services.
[Please Register or Login to download file] is for the Java-enabled mobile phone, covering the US and 15 European countries - visual and voice guidance to any destination; search or define any location by its address.
[Please Register or Login to download file] is a simple application for Java-enabled smartphones to create GPS track logs.
[Please Register or Login to download file] is free GPS software for mobile devices which support java (J2ME). It is developed for nautical navigation, but can also be used for biking, hiking, and more.
[Please Register or Login to download file] - for Motorola A780 - includes touchscreen support and offline raster maps.
[Please Register or Login to download file] enables users to locate and follow friends on a map in real-time, upload media, and more.
[Please Register or Login to download file] - you can see what your friends are up to and you can locate both them and yourself on the map.
[Please Register or Login to download file] is a free GPS track maker for mobile devices that allows you to track any mobile phone or PDA with built-in GPS (or with Bluetooth GPS receiver) in real time.
[Please Register or Login to download file] - locate yourself and your contacts in real time.
[Please Register or Login to download file] includes local search, routing, mapping, people spotting and special interest networking all in one package. With your GPS and Earthcomber’s patented system continuously looking for everything you want, you now have superhuman awareness.
[Please Register or Login to download file] - GPS/J2ME Mobile application for tracking and mountain routes.
[Please Register or Login to download file] is an adaption of the Scotland Yard board game played in real life.
[Please Register or Login to download file] is an application for mobile phones, which are able to run Java ME and connect the GPS navigation module (practically the majority of new phones with Bluetooth technology).
[Please Register or Login to download file] - A system that posts virtual tags close to speed cameras in order to warn the other drivers.
[Please Register or Login to download file] is the [Please Register or Login to download file] rangefinder solutions for your mobile phone.
[Please Register or Login to download file] is a geocaching Java midlet for mobile devices.
[Please Register or Login to download file] allows you to determine your current location with or without GPS, get driving and transit directions, and get phone numbers and addresses for local businesses.
[Please Register or Login to download file] is a tracking application that runs on your phone, talks to a GPS and enables you or other authorized people to see where you are on a Google Map.
[Please Register or Login to download file] is a java 1.5 command line tool for the manipulation and analysis of track and waypoint data recorded with a GPS receiver.
[Please Register or Login to download file] is a location-based service for trip tracking from mobile. In real time tracks are traced on Google maps and stored in an online archive.
[Please Register or Login to download file] is a program for communicating with Garmin GPS units and is easily extended with a plugin functionality.
[Please Register or Login to download file] allows you to connect a bluetooth GPS to your cell phone and update your position on GpsGate.com.
[Please Register or Login to download file] - A j2me app for navigation
[Please Register or Login to download file] polls GPS positions from a GPS receiver connected to the gateway by a serial link or other receiver.
[Please Register or Login to download file] is a free, fully offline vector based map application for your mobile phone.
[Please Register or Login to download file] connects to a GPS and records the path that you travel.
[Please Register or Login to download file] shows the time, the current location, the speed, and the moving direction on the display of the mobile phone and runs on all phones, which at least support CLDC 1.0 and MIDP 2.0 and which allow access to Bluetooth (JSR 82) or the serial interface.
[Please Register or Login to download file] is able to show maps downloaded from the Expedia map servers. It may connect to a gps device and track your position on the maps.
[Please Register or Login to download file] is a free viewer of free access maps based on tiles (OpenStreetMap, YahooMaps, Microsoft Bing, ...), with a WMS, WMS-C client, address and POI search, routes, hybrid location and many more things. It runs with both on/off-line modes.
[Please Register or Login to download file] is a free GPS tracking service. Track vehicles or other objects online in real-time using inexpensive cell phones.
[Please Register or Login to download file] is an interface to Google Maps.
[Please Register or Login to download file] is a tool for editing gps tracks and planning (multiple days) tours (GPS track editor).
[Please Register or Login to download file] is an editor for OpenStreetMap written in Java 1.5.
[Please Register or Login to download file] offers live vehicle tracking locating the live positions of moving objects, whether they be cars, vans, trucks, people, smart phones, or PDAs.
[Please Register or Login to download file] allows you to use your cell phone to submit your actual GPS locations live to the internet, where friends, family and colleagues can watch your current location on a map in real-time.
[Please Register or Login to download file] provides information or services relevant to your location when you ask for a particular web page on your phone.
[Please Register or Login to download file] loads map sections according to the current position from a Web service from the Internet.
[Please Register or Login to download file] - An application for Java2ME-enabled mobile phones and PDAs.
[Please Register or Login to download file] - track or share in real-time your sporting activity over land, sea, or air using your mobile cell phone and GPS.
[Please Register or Login to download file] converts OpenStreetMap data into a map that can be loaded onto a Garmin GPS device.
[Please Register or Login to download file] displays Google Maps, Yahoo! Maps, Windows Live Local (MSN Virtual Earth) and Ask.com Maps and satellite imagery on Java J2ME-enabled mobile phones, PDAs, and other devices.
[Please Register or Login to download file] - Explore trails using the mobile phone and GPS unit.
[Please Register or Login to download file] can act as as stopwatch/running watch and together with a GPS it can show distance, lap time, speed, etc.
[Please Register or Login to download file] will track a friend's GPS enabled cell phone from another phone or the Web. It currently works on most Nextel phones with Java, GPS and a data plan.
[Please Register or Login to download file] requires either an external Bluetooth GPS or an inbuilt GPS (for example as in the BlackBerry 8800 or the Nokia N95) and provides moving map functionality.
[Please Register or Login to download file] - (Polish)
[Please Register or Login to download file] is free GPS software for offline navigation and vector maps of all countries of the world.
[Please Register or Login to download file] is a point-to-point route search and GPS navigation service.
[Please Register or Login to download file] is a wireless positioning system that triangulates signals broadcasted from Wi-Fi access points and cellular towers to help the users find their way in most major metropolitan areas worldwide.
[Please Register or Login to download file] is a navigation system for mobile devices (PDAs, smartphones, cell phones, etc.). It gets the positioning data from any NMEA capable GPS receiver and displays the position on a digital map.
[Please Register or Login to download file] is software for mobile phones that sends notifications based on one's calendar and GPS.
[Please Register or Login to download file] - access Bluetooth GPS devices from mobile devices.
[Please Register or Login to download file] is an application for managing coordinate data from GPS systems.
[Please Register or Login to download file] shows you the direction to Makkah in relation to the position of the sun.
[Please Register or Login to download file] is a system that allows the easy creation of roadbooks through graphical description of routes using reference points.
[Please Register or Login to download file] is a tool to convert routes (really).
[Please Register or Login to download file] is for running and cycling - log and map your tracks and results on the web, analyze afterwards or share with your friends.
[Please Register or Login to download file] is a travel guide for selected European destinations.
[Please Register or Login to download file] - Outdoor GPS multi-player game for mobile phones.
[Please Register or Login to download file] is a mobile-phone GPS package with integrated web-based GPS tracking.
[Please Register or Login to download file] is a small free utility for exporting GPS track profiles into PNG images.
[Please Register or Login to download file] alerts you as you approach police speed traps.
[Please Register or Login to download file] - J2ME application for GPS navigation and tracking.
[Please Register or Login to download file] is a position tracking client-server system. It's designed to assist people in setting up a realtime tracking environment with either a private or public tracking server.
[Please Register or Login to download file] allows GPS users to view and analyze their recreational and sports activities (tracks). The track will be viewed in Gmaps, and users can analyse different metrics (speed, distance, heartbeat, and more).
[Please Register or Login to download file] - simple GPS navigation for java phones for geocaching, walking, cycling, sports, etc.
[Please Register or Login to download file] is a free GPS application for mobile phones with a combination of maps, GPS recording, and statistics.
[Please Register or Login to download file] - Java based app offers navigation in Europe and North America.
[Please Register or Login to download file] is navigation software for java enabled mobile phones, based on map data from Open Street Map.
[Please Register or Login to download file] is a WMS client map browser with Bluetooth GPS support and tracking/waypoint features for your mobile phone or PDA.
[Please Register or Login to download file]

Fantastic response... Thanks

Amaze is a failure, working through the list.