How to change base map in Basecamp to routable OSM street map?

We need more information to help. OSM maps often have 2 ways to download them, either a .img file that is meant to be downloaded to a device or an installation file(s) that install the map to your PC for BaseCamp to use. Ideally for your use you need a map provider that offers the latter. Which maps have you been trying and I can have a look at them, or if you say which area you want I might be able to recommend one.

Well, that’s certainly something I never heard before.

I have watched at least a dozen videos on YouTube that show the host installing different maps to Basecamp via the maps folder, and no one ever mentioned Base camp requires special maps.

As far as sources, I typically use GPS file depot to find maps, or, use MI-Hunt for small, finely detailed maps of the forests.

But none of the Mi-hunt maps are routable.  They can be downloaded as overlays, and you can drop waypoints on them within Basecamp, but I can’t route to them.

To get from my home to the rendezvous point requires highway routing all the way to the Federal forest roads.

The OSM’s I hoped to use came from “Garmin.openstreetmap.nl” and ,”Open map chest.org”, and “bbb something”

I guess I don’t care where the new, more detailed base map comes from, as long as it is routable.

Since I like to learn, perhaps you can direct me to where this special downloading requirement is explained?

TIA,

Greg

What Garmin device are you using? Basecamp can often just read the map from the plugged-in device.

Another approach is to use a USB emulator. This is easy/simple.

http://www.ltr-data.se/opencode.html/

Make sure it’s read-only.

Put the *.img file in \Garmin on the fake USB drive. (Note that you can rename tge *.img files.)

You could also use a real USB drive.

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Garmin uses “Basemap” to refer to maps that have very little detail. They don’t have routing information and not enough detail anyway. 

You don’t want another “Basemap”.

8625906

I wouldn't call them 'special maps' but you do, if you want maps installed on your PC for BaseCamp to use, need them correctly installed on your PC. Openstreetmaps certainly provide the correct files to allow you to do this, and provide a link explaining how to do it correctly that leads to https://alternativaslibres.org/en/use.php

You can also as dpawlyk explains use either a virtual or physical USB drive as BaseCamp can read .img files from that. Openstreetmap also provides .img files.

In the current version of BaseCamp (4.7.x) the map folder should be placed in (C:):>Programdata>Garmin>Maps folder.  The map folder name should end in gmap if it is for use in BaseCamp.

That's true of the Garmin CN maps, many, if not all, 3rd party maps will be elsewhere, mine are all in C:/Garmin

I do tend to add and remove OSM maps as needed and end up downloading a new map when needed

I place my OSM map folders in the location I gave, no longer have C:/Garmin folder, and all works well.

Edit:  As stated, I don't use these maps often.  I checked what's currently in my BaseCamp and I believe the maps were downloaded from www.openfietsmap.nl