This could be the dual road/cycle product that you want click here rather than a walking/biking only device like this one click here.
The advantage of the PC based MemoryMap/Anquete mapping that download maps to your portable device, is that you can also print off the area you want to use, draw on it, make notes etc and then just chuck it when it's too scruffy to use anymore. I'm not sure if the Road Angel gives you that function.
Have you checked out click here they know everything about GPS systems and devices. And have good reviews of all the products available.
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