Lowrance IWAY 350C GPS System & Media Player

ok so right out of the box it didn't work. i dunno if this is an isolated thing, but the first time i calculated a route it gave me a route that took 1400 miles to go what usually takes me 40 miles...ya a difference of over a thousand miles....told me it would take me days to go what usually takes me less than an hour...after that it just stops working all together and now iv got a blank screen with an arrow on it..it doesnt give me any menus or maps...just a black arrow...next ill move on to the battery life...doesnt come with a wall charger and there is no way to change the batteries...i thought built in batteries would be better but i have never been able to hold a charge more than 40 min...even though it says the battery life is up to 15 hours....next the mounting bracket always falls off my window when im driving which makes for a very safe drive, while your fumbleing around trying to pull the device out from under your feet on the freeway...oh and u have to buy your own memory card..not to much nice to say about it..kind of a waste of money...