I have a garmin etrex or etrec legend hcx it has a more sensitive receiver the thing will work indoors, honestly. holds an sd card which is nice. Just bought an sd card for colo. for our hunt in oct. I have had it for about 3-4 years with no problems. $249.00

The card will need to be of the microSD variety.  Garmin uses the "x" designation to signal units that accept the memory cards.  Currently they will take and work with cards up to 4 GB in size.

I have had my Legend HCx since back in '08 and have been pleased with the performance.  There was a problem with their firmware program and how it worked with the receiver chipset but it seems they finally got it worked out after a period of much user frustration with the cavalier attitude Garmin projected about getting it solved.  Kind of a "it's close enough" attitude.  You could be standing still and it would show you moving a 1 mph or you could be slipping along at 1 mph and it would show you standing still, that kind of stuff.  It had real issues with slow movement, full out walking, running, biking, driving were all good.  I downloaded every update for over a year before it seemed to get better. 

I have wondered about the Rhino units since you have radio, GPS and group tracking all in one device, very handy. 

I hunted with my buddy who has one the gps part is good, It will actually, at least his does, show the position of all the people using rhinos in the area, not just your hunting buddies. That could be good and bad, As far as the radio part his sounds like crap, when the rest of us using other radios were trying to talk to him. we ended up giving him a diff. radio to use. It would be nice to know where your hunting partner is, though in an event. and they will do it

I love my Garmin Summit HC. I had an older Magellan 2000 and Garmin Legend (the old blue one) and I had problems with poor reception. The HC (heavy cover) version is much quicker and picks up more satellites than the old ones. It's also small. I carry a separate radio.

How do the National Geographic maps compare to the Garmin 24K maps?  Bought the SW DVD from Garmin last year, but it does not show the private/public splits.

I have a magellen triton, and use the nat geo maps on it, I love it