So far as I know, only Mapsource works with Garmin units.  (Since the software is proprietary, its not very likely that other sources can supply the maps.)

dd

I know we've discussed this before, but I can't find it either.

I thought there was something for Minnesota Lakes, but all I can see now are the Mapsource US Topo (1:100k) and US Topo 24k National Parks (1:24k, includes BWCA coverage) that would meet your needs, from here...
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PS: if all you want is BWCA maps (&poratges, campsites) on your 60csx for your trip, I think you could get someone (local QJ friend?) who already has Mapsource to load it for you, but I'm not 100% sure about that.

-Tom

PPS: This is the Minn Lake thing... I don't know how good it is.
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WW: Given your timeframe & travel plans, here's my suggestion:

1) Buy Garmin Topo US (or the 24k park one or the Minn Lake one)

2) Read the directions & load the desired detailed topo maps onto your GPS (don't plug the USB in until you've read the instructions! Drivers need to be installed first!  With my GPSMAP 76C is seems like it needs to be plugged into the same USB port also. That's how I learned how helpful Garmin tech support is! )  --- most of the work is finished, but important details remain.

3) When you get that far I'll e-mail the BW portage & campsite stuff is on Azalea's site in Mapsource format (get the .MPS files from the link below) .  Get those, load them into Mapsource & then you can load (a subset of) those onto your 60csx.
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-Tom

The Website that azalea mentioned is a great resource for user-created Garmin maps. They also have a tutorial on how to load Mapsource if it didn't come with your GPS: (You need to Login or Register to view media files and links). Many of the user-created topos are better quality than what Garmin sells. But, you do need Mapsource to load them. So, follow the tutorial and you should be fine.

Also, if you search around you should be able to find a GPX with all of the BW campsites and portages listed.

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I haven't tried the map for Maine but I do have most of the Mid-west loaded on my GPS including the map for Minnesota. It works great and the topo detail is better than the 24k National Parks for Garmin. I do not have the Lakemaster so I can not compare it. I did notice some shore line errors in the Minnesota map from the gpsfiledepot. But, so far, any error that I have found has been minor. The map doesn't contain any bathymetric data for the lakes. I'm sure that is there is a good public source for that sort of data the map authors would be willing to add it to their maps.

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Here is a list of all the map data available for Minnesota: (You need to Login or Register to view media files and links). There are several maps available including snow mobile trails, county boundaries, and topos. The Minnesota specific Topo is available here: (You need to Login or Register to view media files and links). It is a simple installer that only needs to be double-clicked to add to MapSource. And, here is a tutorial on how to send the maps from MapSource to the GPSr: (You need to Login or Register to view media files and links). All of it is about as easy as it gets.