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Just to fully answer your question.... yes, mapsource is designed to erase the existing map(s) in the gps when you send a new one. It will always name the map file gmapsupp.img, and older GPS'es would only recognize a map file of that name.

But the Oregon and other new models don't have that restriction. So use Seldom's trick of changing the map file name after you upload and you can install multiple maps.

No, there isn't any compatibility between Garmin and Magellan maps. There are some programs for making your own Magellan maps, but they looked a bit rough around the edges last time I checked. You may be able to share the .gpx files with your Magellan friends though. I don't recall whether Vantagepoint (the Magellan equivalent to Mapsource) can read them.

For help with Magellan mapping, you could visit http://www.tritonforum.com/forum/viewforum.php?f=32 (this is for the Triton series). But GPSFileDepot only has maps in Garmin's proprietary format.

FYI, there really isn't a "free version of Mapwel". You can download the program and everything will work on your computer without paying anything. However, when you send the map to your GPS it will strip out some of the details which makes it pretty useless.

So you really need to purchase either the basic or advanced version to do any "real" work.

Actually this program would probably do just what you want with only a few clicks but it's still in beta. You could contact the author and see if he will send you a copy though: http://www.gpx2img.com/

The 400t doesn't have any option to turn off the basemap (AFAIK). It is not listed in the map info dialog box. I sort of assumed that the US Topo *is* the basemap on this model, but have never really looked into this.

IF you don't need to use the map in Mapsource, you can make things a little easier. Download the free sendmap20 program from the cgpsmapper site. Start that program up and just drag all your .img files into its window. You can either send them directly to the GPS or create a GMAPSUPP.IMG file on your computer.

It should be pretty easy with Mapwel. The basic version cannot save .img files to your computer. It is tied to a single GPS when you register the program and can only upload files directly to that GPS.

The advanced version can save .img files directly to your computer as well as sending to any GPS. But you have to purchase this version before you can do this.

There may be some bugginess on the Oregon 400t related to this as well. I have one myself, and sometimes it don't see a loaded map when I first zoom into the area. For example, if I go to a waypoint that I know is inside the area, sometimes I still see a blank map.

If I try this again, usually it works the second time. Haven't quite figured out what the pattern is to this or why it would happen.

Maps have a stacking order, like layers in photoshop. Whichever one has a higher draw priority will cover up the other one. Disable all maps except the one that you want to use.

Are you sure that you're within the coverage area of the map you want to see?

Very few, if any, of the maps here are routable. The maps at the link posted can do routing, but not address search. So they can tell you how to get from point A to B, but can't find the address of a house and route you to it.

[GB]

I'm getting a 64mb Etrex Legend.

If it's really just an "Etrex Legend", then it doesn't have a memory card slot and you will be limited to the amount of internal memory. The current models of the Legend series are the Legend , which only has 24MB internal memory and no card slot, and the Legend HCx which has a card slot.

The discontinued Legend had a black and white screen and only 8MB internal memory with no expansion. This was followed by the Legend C (which I used to own myself) which had 24MB internal memory and no expansion. Then there's the Legend Cx which is also discontinued; it had a memory card slot.

I'm not aware of any Legend that had 64MB. Do you perhaps mean a Legend HCx with a 64GB card? I would really advise against buying any of the Legend series unless it's the HCx. You will find 24MB extremely limiting.

I think I would have to nominate Boyd's NJ Pine Barrens map.

Hey - thanks guys, just now noticed this.   I am finishing up an expanded version covering all of New Jersey and parts of surrounding states. It's gonna be a BIG file.

Nice job on the new search results page - looks great!

There was one map when I changed the name from the GMAPSUPP.IMG to ARK Topo.img on the computer while hooked to the GPSr, the name did not change on the GPS

The map name which the GPS displays has nothing to do with the name of the file. It comes from information inside the file. So changing the file from GMAPSUPP.IMG somethingelse.img will have no effect on what you see on the GPS.

But I would suggest not using blank spaces in the filename, as in your example "ARK Topo.img". That might create a problem. We have seen a number of odd filename-related problems with the custom maps feature on the Dakota and Oregon. To play it safe, I only use letters and numbers in my filenames, with no special characters and no whitespace. Your mileage may vary. 

Unfortunately you should have gotten either an Oregon, Dakota or Colorado since those models can use two different forms of raster imagery (pictures). There are "custom maps" which you make yourself: http://www.garmin.com/garmin/cms/site/us/onthetrail/custommaps

Then there's Garmin's new BirdsEye subscription service: https://buy.garmin.com/shop/shop.do?cID=255&pID=70144

But the 76cx is an older model which can't do either of these I'm afraid. You could have a look at MOAGU and Mapwel though. They are hacks with some significant limitations, but might suit your needs:

http://moagu.com/
http://www.mapwel.eu/

Then I re-downloaded the maps again.  All the maps I wanted are showing in Mapsource on the pull down window.....BUT....there is no file called GMAPSUPP.IMG under Garmin.  The only map in the Garmin folder is the basemap PCBSMP2.

Sorry, you are really getting confused here. The PCBSMP2 is a file on your computer which Mapsource uses. Don't mess with any of that stuff. Don't even look in those folders, you should never have to. Mapsource uses these files to build what is sent to the GPS, you don't need to access them yourself. You really don't even need to know anything about .img files. Mapsource handles all that for you.

After selecting the map segments you want use Send to Device. As the others said, it will create the gmapsupp.img file in the \Garmin folder on either your GPS or a memory card (depending on which you choose). AFTER you have done this and verified that the map works on your GPS, THEN you can change the name of gmapsupp.img to something else. This file will be located either on the GPS itself or on the memory card. When you connect the GPS to your computer in disk mode, you can browse to it. DO NOT mess with any of Mapsource's own program or data files.