Well, it's been a few weeks since my N6 trial finished. I initially bought another month's HD Traffic from Tomtom (£3.99) but it's got to my HD Traffic renewal time again - and I think I'm going for Navigate 6 instead.
The main reason is the Tomtom HD Traffic renewal is about £26.99 for the year. It's cheaper to buy Navigate 6 navigation (£11.99) with HD traffic (£7.49) for a year than just to get the year's HD Traffic with Tomtom.
There are some things I'll miss from Tomtom though:
- Ability to program avoiding part of route.
- Ability to block route immediately in front of you.
- Ability to manually avoid traffic incidents
- Adding via points as co-ordinates, address or postcode (N6 makes you select them from the map).
- Route immediately returning to default when traffic delay expires.
- Keeping track of things sensibly if GPS signal lost (e.g. tunnels)
Most of the things I'll miss from Tomtom are due to disappear when it's "upgraded" to use the same Nav4 / Navkit system as the new Go 400, 500, 600, 5000, 6000 units. Navigate 6 works so similarly to them I suspect that it may well be based on Tomtom's own Navkit development kit and basically be the same thing with a different skin on it.
I mainly use navigation for traffic avoidance during commuting. N6's more aggressive traffic avoidance seems to suit me, although it does give the odd strange diversion off main routes, seemingly trying to avoid the odd traffic light etc.
Regarding the differences in routing: Essentially, Navigate 6 looks for the absolute fastest routes it can calculate, including traffic, during route planning and offers you options up to the fastest 3 different routes. I haven't yet pinned down what criteria will cause it to redivert once on route and diversions often remain in place after traffic has expired (I've reported this to the N6 development team and they are working on a fix).
Tomtom initially plans the fastest route according to its historical road speed database (speed profiles / IQ Routes). If traffic is detected on the route it will then check for faster alternatives but it looks for several minutes clear saving (meaning that minor 1-2 minute delays are not avoided). In practice, it will miss some of the local diversions that Navigate 6 can work out, even if you manually program it to avoid incidents. Once the journey is in progress Tomtom keeps checking traffic vs key diversion points where it can re-route around the traffic. Small local diversions are detected very late, whereas Navigate 6 tends to pick them a long way in advance.
I note that Google's traffic service has been improved by incorporation of Waze indicent data, including a data feed from the Highways Agency. I'd be happy using Google Maps to navigate and avoid traffic for longer journeys but its pathalogical attraction to staying on main roads means I don't like it for use as a commuting aid, where I'm already familiar with the various routes. Waze itself has potential but there are currently nowhere near enough users near me to give early warning of traffic. If Waze one day incorporates Google's traffic flow data (or Google Maps incorporate Waze's routing), I'm fairly confident it can dominate the market in urban traffic avoidance - especially as it's free.
I still have Navigon with traffic on my phone too. The traffic indicents are accurate enough but currently limited to Motorways and primary A Roads - which again limits it as a commuting aid. Its ETAs are always hopelessly optimistic to the point of requiring illegal behaviour to keep up with them. Navigon does, however, pick up some road closures usually missed by HD Traffic (e.g. the A57 Snake Pass and other high routes in Derbyshire when it snows). For this reason, I sometimes use it to check my routes for traffic when I'll be navigating with Tomtom / N6.
Sygic's another navigation app with potential, using Tomtom maps, but crippled by hopelessly silly urban routing. There was talk of them using Tomtom's IQ Routes / Speed Profiles in future but that's gone very quiet of late. I've not used it since they incorporated Tomtom's HD Traffic but I gather you have to avoid indicents manually - so I'm not interested in trying it again.
I liked Co-Pilot Live Premium when I last tried it a couple of years ago, but again its traffic data is limited to major routes. It also didn't have automated dynamic traffic re-routing and required a button press to accept faster routes it found. That's a major no-no for me but I'd be interested to hear if they've sorted it out yet.