We use the Lowrance Iway 500c. It has a 5" screen and gives verbal directions if you want. I liked the Lowrance because of the bigger screen. We have ours mounted in the center console down below the dash so we use an amplified external antenna with it to get good satelite reception. So far it has worked great.
Me, "outnumbered" by three red heads...my dear wife
& 2 DD's, plus Sam & Taylor the yellow camping labs.
2001 GMC Sierra 2500HD Crew Cab 4X4
8.1L big block/Allison
06 Mountaineer 319BHD w/Trailair Pin Box