for anyone like me who used to have trouble converting grid references to longitude/latitude for your garmin305 if you have a iphone 3g there is a application for it that does this for you just go onto the itunes store into the navigation section of the applications and it is called GB locate, but it will cost you a massive 59p to download it. there are loads of other usefull downloads for free in this catagory mostly free for the iphone