looks like Hike gave the right advice.more fuel for the stove and some real high energy foods..i assume you have a repair kit and spare gas.with other riders around and that phone you would be at worse inconvenienced if anything went wrong and not looking at a survival situation.i would keep a eye on the weather,just cold is no big deal with modern snowmobile suits but a heavy snow storm could slow you down to the point of not making the next town for the nite..if you get a chance stop someplace at the end of the trip and try and make a fire with the kit you have along to see how it works out in "real life"..photos would be great--