Martin Gardner.co.uk

source: Nokia forums
This will save you a lot of time and head pain trying to install unsigned apps.
This wont take longer than 10 minutes, if you read and execute properly.
Please download the following files from this link (Not my own files)
http://rapidshare.com/files/121640151/N95_Files.zip | 403 KB

Update: New version of Garmin with Full install Tutorial with download links

how to enable the N95 built-in GPS to be used with Garmin Mobile XT software, where we can download free maps from local portal Malsingmaps. Details are taken from this wonderful site.