A lot of people are looking at the Rino 530. A full power handheld radio, married to a gps, and the ability to transmit and recieve locations with units of "like" technology. A step up from the early Rino's if you can afford the price. In the same package you are getting the great Garmin 60CS with a full power handheld radio.
I know some people in Law Enforcement who work rual areas who wish there LE radios had the same position tracking capability. I suspect that one of these days we will see multi-channel radios for LE/Wildland Fire that will have the same ability.
If I had the funds it would be on my wish list.
The only software you will be able to load on to the Rino 530 are Garmin MapSource products. I would recommend Garmin's United States Topo. What is confusing are the half truths from other mapping software manufactures who claim their product is compatible with Garmin units. The truth is that waypoints and tracks can be transferred from their product to a Garmin unit. And you can us the Garmin unit to track a position when connected to a PC. You can also download waypoints and tracks to other mapping software. But you can only transfer Garmin maps to a Garmin gps. You cannot load brand X maps on to a Garmin. Well maybe you can if your a tecky hacker.
I suggest before your trip that you obtain up todate BLM or Forest Service maps for the area you are going to hunt. These maps will show current road systems. You can also download free topo maps from<
http://www.TopoZone.com >. These maps maps will provide more detail then the United States Topo software. For years I have setdown a drawn in updates on Topo maps. Manufactures obtain their mapping data from the USGS. Most topo map data has not been updated in the last twenty years.
Get the unit in a timely manner so that you can learn how to use it before your trip. Happy hunting.