Now days the price of GPS has come down, and the quality has gone up so much that they are the way to go. There are many fine pocket-size GPS that work well, are easy to use, and are affordable. Make sure that you know how to use it, and have a spare set of batteries along.
I would still take along my old-faithful Marbles. There is a pin-on on my fishing vest. It never leaves it's spot, and has saved my bacon more that once when fog set in quicker that planned.
When I am going to be in unfamiliar surroundings, a little brass Marbles is in my pocket as a back-up.
Neither one is accurate enough for surveying, but either one will get me home with no drama. The ones I have are really old. I have heard that the newer ones are plastic with a brass coating. I do not know if this is true or not. Neither one is liquid-filled. None of them were. If there is no liquid to leak out, you don't have to worry about it.
There is a company that makes a similar one. That is Tru Nord. They advertise that if you tell them your Zip code, they will adjust it to your area. This may be a nice feature, or not. When I go to a different area with my old Marbles, I just look at it and mentally make what ever adjustments are needed. Again, not extremely accurate, but plenty close enough for anything I have done after leaving the military.
My ideas on the subject will drive purists crazy, but they have worked well for me.
Good Luck
