Satnav head-to-head: Navman S100 vs TomTom Go 540 Live
The biggest names' top-of-the-line satnavs slug it out
Navman's main menu is uncluttered, but thin on features
Navmans Glide Touch UI means you have to scroll through many settings to find the one you want
The Navman navigation menu hides itself at either side of the screen when not in use
TomTom’s petrol pricing is a nice idea, but it rarely got prices spot-on
With built-in GPRS, traffic updates are hassle-free on the TomTom, but cost £8 a month
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