The only way to fire a script from an armband is by using the spells.2da table.
If you want to take a shortcut, download my whereamI armband from here:
http://www.starwarsknights.com/tools.php)
Scrap all the files save the spells.2da file and the .uti I also encourage you to a look at the modifications, especially at the spells.2da file and the .uti to see how it's done
Compile the script given to you by tk102 as described here:
http://www.lucasforums.com/showthread.php?t=143681) (check the second post for the easy method) and rename it d3_getlocation.ncs :) If it's something you intend to release, then please modify the name of the .uti and the script - it will require you to change the name of the script in the spells.2da file.
Edit: Note to self: ugh! I really have to release a new version of the armband that uses the TSL patcher!