The VSC-N530A GPS by Visco is a clone of the Holux GPSmile 52+. Or at the very least, a damn fine copy. 😉
Note the the called Holuxshell in the residentflash directories:

VSC-N530A Holux

Visco offers map files to registered GPS owners on their website.  Its going to take me 72 hours of straight downloading on dialup just to recieve them.  If anyone out there has access to the files could they find out if the maps include Alaska, Hawaii, and Puerto Rico?