Whilst there is the excellent Nokia Maps application available on the Nokia N9, sometimes there are just those days when the planets are not in alignment, you've had to resort to using ForeverAlone to unlock Angry Birds Magic levels, and you just have to have Google Maps on the Nokia N9. At this stage there is no specific app to get Google Maps onto your Nokia N9, however there is a workaround. Legoman666 from the Talk.Maemo.org forums has suggested that the web version of Google Maps works, and my own testing shows that whilst it is not as good as a native app, it certainly comes close. Thanks to Legoman666 for this tip!
The original thread is located here: http://talk.maemo.org/showthread.php?t=79516
To access Google Maps, first open up the "Web" application on your Nokia N9 (I have found that it works best in this). Go to this page: http://www.google.com/maps/m .
Voila. Seems to work well. One can search, zoom, and scroll. If you tap the options button at the top right, and the click "Add to Apps", you can then access this page from the homescreen. Enjoy!
UPDATE: Google have found out about this loophole, and have since closed it for Nokia N9 users in most countries. Still no news on an official client, or anything resembling it, but there are some alternatives, albeit lacking in usability or features.
1. Access http://tomch.com/maemaps.html from the web browser.
2. Install GApp: http://everythingn9.com/gapp-released-for-harmattan/. Once installed, Click "more" at the top right, then Search -> Maps. It is a very dodgy implementation, works about half the time. I couldn't even get a screenshot working.
Any comments or questions on this article can be posted below.
Please note: Prior to undertaking any modification detailed above, understand that there are risks involved. Whilst every modification has been tested to work on the author's Nokia N9, there are no guarantees it will work on a different Nokia N9 or other mobile phone. EverythingN9 will not take responsibility for any effects of a mod, including hardware or software damage, telecommunication charges, or legal implications.