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Got both working fine together on an older Oregon 200 gps,  My Trails and Garmin Northeast US 24k topo. 

You need to zoom way in for the trails to show, assuming it was really enabled.

Unless these have changed, I believe both of these maps are .img files that you simply load directly onto your garmin.  They are transparent maps that are meant to be used with other maps.  The instructions for the CityNav-Night Mode for Oregon/Colorado/Dakota say; "Instructions: Unzip the folder and place the contents into the Garmin folder on your GPS or SD card. Enable the map along with City Navigator."
You may be able to use MapSetToolKit to install the lake depth map into Mapsource or Baecamp.....but you will NOT be able to view it on the PC overlaid on other maps.  All you would see are the lake depth contours.  It seems pointless to install the CityNav-Night Mode map on the PC for the same reason....except all you would see is the black background.  I do use the CityNav-Night Mode map on my Oregon handheld and it works very well.

Or, if you'd like gpx files of the tracks already converted from the SHP files, you may look at these links:
http://www.topofusion.com/at-gps.php
http://guymott.com/atgps.html

They are both based on the Appalachian Trail Conservancy data.  FYI.

I've also been very happy using the Sanyo Eneloop batteries.
Excellent at holding a charge on the shelf.  Also seem to outperform higher capacity batteries I have used in terms of battery life ( ie. runtime on the gps) for a fully charged cell.

Like Seldom said, you definitely don't want to add any maps to the memory card if it was purchased preloaded with maps.  If you have the DVD version, then you could pick both mapsets and send them to the same blank (formatted) memory card.  Or, if you bought the preloaded City Navigator card, you could temporarily remove it from the GPS, send the contour mapset to the internal memory.  Then re-insert the memory card.  (Simply to avoid the possibility of sending the new maps to the memory card by mistake and overwriting your City Nav maps.)

You may just want to try the Georgia Topo on its own card and see how it looks by itself for the areas of interest to you.  The Topo maps I have used from this site are all excellent.  Many of those were authored by Maps4gps, like the Georgia Topo you are considering.

If you already had City Navigator or some other "planimetric" mapset, then you could just add the transparent contour mapset.  That would allow you to turn on or off the contour lines.....which I have found to be helpful at times.   Especially in locations where the contour lines make the map look very busy.

I agree with using the Eneloops.  Have tried a few brands and they seem to work the best.  Also, the Duracell "pre-charged" batteries that have "made in Japan" written on them are actually rebranded Eneloops.  They are also recognizable by the white top around the positive tab.  (The ones with a black top are NOT Eneloops.)

Try this:

http://garminoregon.wikispaces.com/Waypoints+and+POIs#Waypoints-W9.) Why can't I see all of my waypoints in the nearest waypoints list or the Waypoint Manager?


Option 2 works well for me......if I understand correctly what you're trying to do.

Working fine here.  Successfully downloaded and viewed Coffeyville KS east and west quads.  (As well as several in my area.)  Running WinXP 32 bit using Chrome for the browser.

What's the IMG file called?  gmapsupp? And what's your software version? My OR300 is running Software Version 4.10 and GPS software version 4.52, and like I said above, all my multi tile mapsets may be listed on the enable/disable button, but they all are enabled or disabled at once.

That file is called gmapsup2.img.  That was one of the first ones I created when I got the unit...before I realized the flexibility allowed with the filenames.  I have 5 other img files on the memory card.  Most have more descriptive names like TopoOverlay.img.  I'm on SW ver 4.00 and GPS ver 4.52.  I know there are more recent ones, but I'm waiting for most of the new bugs to be caught and fixed.  This version has been very stable for my usage.
This "bundle" mapset is the only one I'm using that has tiles from multiple maps.  If I created it over, I would make them separate.  If for no other reason than remembering which maps are in the file.

Huh?   I have an OR200 and one of the IMG files I loaded on my microSD card consists of tiles from 4 different maps.  They can each be enabled independently just fine.  I just powered up and checked to make sure.  But I agree that the best approach on the Oregon units is to give each map a separate IMG filename.  That way I only create them once and drag the ones needed to the memory card....instead of re-creating the file in Mapsource.  That is what I've done when I've added additional maps from this site....made each a separate file. 

What the heck are WIHAs anyway?  Do they stay the same each year or will I need to update the map each year?

I have no knowledge of these, but a few online searches yielded the following:

Walk-In Hunting Access (WIHA) tracts in Kansas.

WIHA property can be removed from the program at any time; in this case "No Longer Enrolled in WIHA" signs will be posted. Once these signs are posted, access is prohibited.

Take a look at the first picture of the tutorial on this site for "How To Load Maps On My Garmin GPS Unit"  That is the drop down selector for the maps that you are looking for.

http://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/

A couple of quick spot checks in Indiana seem fairly close too.