I use Google maps everyday. Mine does all that in one place. If I was guessing... at some point in time you have set (maybe accidently) defaults that are driving you all over the place. I am not sure if you need to undo things in Maps, your browser, Navigation, or all of the above. Menu>Manage Apps> then look at all of the different places you list and see what is in the "Launch by Default" sections of all those apps. Clear those defaults
By what method are you accessing Google maps? By just clicking on the 'Maps' icon, or on the Navigation icon?