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Frankly, hearing "Turn right in 100 feet" is quite good enough, especially since the 450 is $300 cheaper.
I used to think that too until a few of the larger cities I have been driving in recently. There are many places where there are more than one choice of right turns within 20 feet of each other. In heavy traffic, it is a huge bonus to hear the street name without having to take your eyes off the road to read the street name on the display screen. Looking up for a street sign name is much easier for me than looking at the display screen, then looking back up for the street sign.
I am sure just about any of gps units out there today will do the job. You just have to decide if the top of the line is worth the extra bucks to you, just like with every other purchase you make. Most guys like me hardly ever know what it is like to always be able to get the top of the line products we want.
One of the important features that "I" wanted but I'm guessing most motorcycle riders would, is the ability to develop routes that we can then feed into the device that don't neccessarily get you there the fastest, or the shortest or any of that, but get you there via the route YOU WANT TI TAKE.
That's thebeauty of the Garmin as it has Mapsource software that allows you to build your own routes, and download them to the device.
I didn't want to pay an arm or a leg for one, so I opted for the Garmin Quest. A discontinued unit that doesn't have touch screen, so you need to use the little buttons.. but that doesn't matter much to me whn I use down loaded routes.
The Quest cost $95 for a refurbed unit from Amazon. Another $47 for the motorcycle cradle and it is a great unit for riding.
Boat US / West Marine has the Garmin Nuvi (touchscreen) on sale now w/suction cup that fits on the gas cap of your bike or dash of your car for $119.00..
Another vote for the Zumo 550 (but the 450 is just as good)... thousands of miles cross-country in all kinds of weather... no problems at all. The updates are great... the computer map makes planning easy... and you can import (with some added work) from the HOG website route development... My only recommendation is to buy a motorcycle GPS that is weatherproof and made for the outside.
I did post on an earlier forum but to repeat my view here. My experience is that basically all the units are perfectly adequate from a core function perspective, much the same as any cell phone works well as a phone, but there are some neat extras and basically it is down to the number and details of maps that drives the cost (certainly in Europe anyway).
I chose the TomTom 720 for my biking use. They do a rider version of TomTom but I struggled to see the benefit unless I was riding in the rain or on a bike that shakes all over the place. In both cases this does not apply, so the standard unit is fine and I have used mine for quite a while now and I am really happy with it.
So why the 720. Simple really, I like using my Ipod on the bike. I know you can plug the ipod straight in to the Aux port in the Audio system, but by using the 720 you can control the Ipod through the TomTom screen. Benefit is immediately obvious - nice big "buttons" on the touch screen which make it easy to navigate and control even with bulky gloves on. With a good quality mount I can plug the TomTom in and then power the Ipod and control it through the TomTom. A single 3.5mm jack in to the Aux port means TomTom will mute the Ipod when voice instructions are coming through (I don't use voice on GPS but others swear by it). I have photos of the assembly if you want to see them
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