If it says PSP-290 on the package and if it looks like this: http://www.digimartz.com/images/game...SP_GPS_290.jpg, then you should be pretty safe.
Map This! should run on all homebrew capable firmwares, though many users reported that on very new firmwares it may not always work that well.
You can read the stickies for FAQs and http://en.wikibooks.org/wiki/Map_This! for an installation guide.
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