hi I have just bought this garmin 550 s its a few years old now and software is outdated 2006, I know its a long shot but does anybody know how to update the software on this garmin , as I understand you can download updates from garmin onto a sd card and update the unit that way , if some one know s how or has done their own would they get in touch , either show me how or do it for me , I will pay someone to do it , and will travel with unit ,im from Doncaster but in Whitby every week thanks nige tel 07866222211