Hi. I;m Derek from Preston. Just bought my first Merc. A 2009 CLK 200K Avantgarde Auto Cabrio. Love the car and equipment level but miss my sat nav unit in the dashboard. Hopefully I can get some advice on here to upgrade the unit with either a Mercedes unit or an aftermarket fitment. Must admit electrics isn't my strongest skill!! Picked up info like the antenna type and location but need info on whether it is plug and play apart from that. Also availability of up to date maps will be an issue. Opted for the smaller engine unit but went for the 184bhp engine. No niggles yet but early days.