I think you might just need to get over your fear of relations, given that relations really are the simplest way to describe routes, and frees ref tags on ways to handle stuff like actual way-bound references (like DOT numbers).

Spam.

spam

I wouldn't make this validation dependent on the ways being tagged with refs, but rather members of route relations as that seems to be the way to handle routes going forward rather than trying to mangle way attributes to describe a route.

Offensive spam.

Tertiary network roads still get highlighted, just not at such low zoom levels.

Obvious spam.

Take a look at the MAX lines in Portland, Oregon for help.

Take a look at the MAX lines in Portland, Oregon for help.

robert: Actually, 0.8 is perfectly reasonable under ideal conditions, particularly if the unit is also a WAAS receiver.

Try downloading the region in JOSM; that will give you the option to download any GPX from the region as well.

Surprised this spam has lasted this long.

You can, Kiwia, but please consider adding other landmarks as well. I'd be lying if I said I hadn't added places of employment to the map myself.

http://www.opencyclemap.org/ (or click the + on the OSM map and select cyclemap)

JOSM is Java...if you have Java6, it should work.

It's a snowmobile, according to Google.

none of these really addresses the problem of being able to use OSM on the Navigon as the base map, as far as I can tell.

There's always the easy way: Get yourself a premade gmapsupp.img from http://garmin.na1400.info/routable.php

How closed is closed in this case?

I don't think it's the OSM server. I think it's JOSM.