I am frugal & have yet to upgrade
I use delorme Topo 6.0 & an USB GSP antenna from my street & maps program
with a simple generic USB GPS antenna it works like gangbusters, something like this: http://www.dieselboss.com/travrout/antenna.htm
2004 GMC Yukon, 4X4 SLT, 5.3L Vortex,
Trail Master 2.5" leveling kit, SkyJacker Shocks -upfront, EGR 1.25" Fender Flares
Putco Punch grille insert, gamut of Putco chrome accessories, & IPCW chrome/clear Crystal Eyes taillights
Whelen Slim-Miser LED Strobes, Husky floor liners, MF 1050 compressor....
N-Fab light bar & Hella 700FF's
Running on 32" 265/70/17 Cooper Discover AT3's
1966 M416 Stevens trailer
My username is my callsign