Review: Hema Navigator 7

I have just purchased a Hemma HN7. It has all the mod cons and should be great for touring and four wheel driving. there is only one problem - when wearing my polaroid sunnies, I cant see a thing on screen due to the rainbow effect. As yet no one can tell me what to do to improve vision other than to take off my glasses! I am extremely disappointed in the product as it was the last thing I thought of when doing my homework to buy a top quality sat nav. A waste of $650.00!