I also have the 1.0 version, but the IPK is actually "zroadmap_1.0_2_arm.ipk"
I can get maps to display of towns in Illinois if I input the correct street address for an address that exists in the database. I downloaded the Illinois package.
I've been reading the documation, and there seem to be 2 additional programs in the i686 linux version. These are:
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buildmap
A program that takes the US Census Bureau files as input and produces the map files used by roadmap. This application is to be run once on a desktop or beefed-up laptop to prepare the map files and is not needed when using roadmap.
and
buildus
A program that takes a set of roadmap map files and produce a directory file that helps roadmap choose the map(s) to display according to the location or city. This application is to be run once on a desktop or laptop and is not needed when using roadmap.
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It seems like you have to use these 2 programs to get usable maps with the ability to save/access maps directly from Zroadmap. Otherwise zroadmap only seems to be able to display the current map that was loaded during the street search. These are zoomable, and you can scroll to adjacent towns, but if you try to save it under a different name, the next time you open the new filename, you will be presented with the original location, (which was found in the street search).
Jon
EDIT I'm just using it as a map reader with the ability to zoom. I don't have a GPS.