I'm out a lot on my own and it occured to me that there is probably some sort of gizmo that at the press of a button would send an sos with my gps location to someone that could render assistance if i got myself into trouble. Would i need to get an expensive gps device? Is there an iphone app? (i dont have an iphone). I'm not having much luck with the search facility as i don't know what words to use. Any advice would be appreciated. I haven't got loads of cash to throw at it, so anything budget-priced would be ok. Thanks.