The Garmin E-trex 30 or the Dakota are two very simple excellent gps units. I would also go to a retailer or online and get a card called huntinggpsmaps.com
This chip gives all landowner info as well as hunting game units, etc. I know they are available for Montana, Wyoming. They are located in Missoula, MT. The chip overides the 100K scale on the gps and converts to 24K.
Garmin has the best customer service of all the manufacturers.