How to continuously plot GPS data (Lat/Long) ?

Hello

I want to feed the UI with Lat/Long data (from GPS device or file) and plot a line/track ( with a arrow symbol at the end). It should look something like the attached pic (a stripped GPS navigator)

Also I would like to have the possibilities to let user point to the 'track' a select a GPS position

Please advice me how solve this
- Should I plot a x/y graph using the Lat/long as is ( Lat/Long as x/y ) ?
- Is there some ready java package/API that I can use ?

Later I would also move this solution to embedded Java device ( J2ME)

Thanks any input :)

Attached are the sources for two classes I've built for dealing with lat/long values.

A LatLong object itself merely holds a lat/long value and has methods to convert it to various forms.

The PixGrid object is more interesting;
it maps between lat/long space and a pixel grid suitable for display.
Especially interesting is PixGrid's tool to map lat/longs to pixels.
To use this tool, I capture an image from GoogleEarth
and note down the lat/long values for points on the image.
Then I make a table listing for each point its lat/long value
and its x,y position in the image. From this table,
the tool builds a mapping between pixel space and lat/long space.

The least-squares routines I used are from
SourceForge.net Repository - [virtualrisk] Index of /util/lma

Hope this helps,
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