Basically, you will need to check if this will work on your garmin, download a new firmware file (usually called gupdate.GCD), patch it with a 3rd-party tool, install the newly created patched version of the firmware onto your gps, then either make or find some .jnx files.
Background info worth reading to check compatibility with your GPS, and how to make Birdseye compatible .jnx maps from other sources: http://whiter.brinkster.net/en/JNX.shtml
Where to find the latest official firmware for your garmin, assuming you have an Oregon 6xx (there are similar "wikispaces" sites for other garmin models): http://garminoregon6xx.wikispaces.com/Firmware
The piece of software you will need to patch your firmware: http://whiter.brinkster.net/FirmwarePatcher.html
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