Actually, what people should be looking for is not the clarity of the maps, but the clarity of the voice instructions. My old Avensis had built-in SatNav which ran on a teeny mono LCD screen on the dash, but was good since you never really needed to look at it while navigating, the voice directions were clear, making use of adjectives.
"In 200 yards, turn HARD right, followed by a SLIGHT left."
I've had many discussions at work about road maps, sat nav and people being idiots.
I only see the real need for sat nav to do the very last part of a journey. I can definitely get to pretty much all the major towns and cities in the UK without sat nav, or a map, by just using road signs (and looking up where abouts they are beforehand). Getting to an actual destination is where sat nav is actually useful.
I couldn't agree more on that, I do often use it for the ETA reason.
PB : That's very true also, but I don't often want to deviate.
But surely there would've been multiple signs showing the split for a short distance before hand.
Either way, yes using both properly is definitely better than one or the other. I tend to know/expect what the sat nav is going to say before it happens anyway based on earlier signs. Though knowing how many miles till the junction you need is nice since it stops me junction counting.