I just got the Orgeon 400t and so far love it. I haven't had a chance to geocach with it yet ( I got it last night and I am workinhg today) but I can get a signal while in my house! This unit is hands down better than my 9 year old garmin (forgot which model). My question, can I use this unit for street nav or should I get a Nuvi or simular model? The street maps are $100 on the Garmin website and I was wondering if it is worht it. Thanks.