I have use this gp a number of time to keep record of route i have take and also help guide I when out in the mountain . and I rather like this gp it be the first one i have ever own and use , and within no time I figure out how to use most of the stuff on it . now for starter the battery life on it be pretty good and I like how you can set it to the type of battery and adjust the set to really max out the battery life . I have it run for a good 13 hour strait well I be out hike and I maybe check it every 5 minute to check for where I be and when be the next turn or area , and when I get back I check the status for the battery not a single drop on the life bar , which mean this can run for a few day without much worry on when the battery will die . but take note when store it because for some reason I end up with 2 dead lithium battery after about 2 day of it be turn off and store , this could have be cause by no sit signal thus it go into search mode similar to when cell phone have no signal and this can drain the battery pretty quickly which might also apply the same to this gp , or because when I put it away I may have put it against something which turn it back on or I may have accidentally hit the power button . anyways when you store it my advice be to take out the battery just in case . now the GPS 's ability to refresh the map as you move be good when move as well as it be ability to accurately give you you location . the manual be not much help , when it come to understand how to operate the GPS , instead go online and look for instructional video or document like I do for thing like how to use the track related feature . the GPS weigh very little when load with lithium battery which I recommend be use if weight matter also because they be slightly better when deal with cold temperature . the screen be also very easy to see clearly in the number of vary light level and even when light be reflect off the screen . now for the thing that really be the problem with this gp and all nearly every other on out there , from what I could learn , be the map you can buy they be extremely expensive and be just rip off it seem of map that be publicly available and\/or be sell in paper form for like a dollar . now if the map be just like 20-30 dollar a set no complaint because they be extremely useful and for I need because of the topo and road information . but over 100 dollar they cost and they only cover about 2-3 set state so you can not have have this and that state but instead this area of the US or that area and just hope the place you travel to be cover in one go . so if you can somehow get the map for free do not turn the offer down .