GGP and the oxygen thing makes no sense to me. Here is why. AT SOME POINT you need electricity. Let me see if i can explain.. There is a large compressor for home use. This is plugged in and a 50 ft tubing with nasal "prongs" is attached. This allows you to move about your home. You get continuous oxygen from this compressor and no need to use a tank. On top of the compressor is another piece.. this is where you refill your portable tanks to take when you are going out. These tanks would last about 3 hours for continuous use give or take depending on how many liters per minute you have the gauge set for. Ok, with me so far? Insurance companies typically give you 2-3 refillable tanks. In order to refill them you need to have the compressor plugged in and then it takes several hours to refill the tanks. For around $3000 , you can purchase a small portable compressor that pulls the O2 out of the atmosphere and eliminates the need for the heavier portable tanks. This runs on a battery. The BATTERY needs to be recharged ~ every 24 hours... SO, you need electricity to recharge the battery. in either scenario.. you cannot be away from a source of power for longer than 9-24 hours depending on what you use as your oxygen delivery system. This is why when there is a power outage the people you see in the "shelters" first are those who are on oxygen. The shelters have a generator for electricity. So, 2+ hours from home.. using O2 on the trip to the campsite, no electricity.. how long can one go without refilling tanks( which have to be done at home) or recharging the battery? 9-24 hours. Unless he just takes a "whiff" now and then. This continuous O2 rumor is not valid. JMO
