The Earthark sites are chosen for their remoteness, dryness, coldness and physical fixedness. That is done to maximize the chance of the physical survival of their contents for a very long time. Placing them on mountainsides protruding from the glaciers helps to assure their findability in the distant future. The accuracy of navigation may not be of high precision after the global positioning satellites are out of service.
A sextant a back-staff or even a simple cross-staff , shown above, will get the traveler well within half a degree of the 83.5° South and in the clear Antarctic air the Earthark mountains would be visible with that amount of accuracy. Thus with simple dead reckoning to one side at that latitude and following that latitude around, even without a clock or navigational ephemeris, the mountains should be easily findable. Once at the mountains a written description of the location and local markers would take them exactly to the location of the Earthark.
Getting there is very arduous however because of the extreme distance, cold, altitude and windiness. The wind may however be a benefit as some people have used it to pull long runner sleds with kites or by using an iceboat. Those entail more risk of accident but may speed things up considerably and be overall less risky than pulling a sled by hand.
Ice Boating Newsreel and Stock Footage
Using a fairly simple device like these iceboats might permit someone to get out to the Earthark with a lot less physical effort. But the iceboat would have to be built big enough for several people and be as stable as possible. It should carry plenty of survival equipment. Another possibility would be to have the sled pulled by a large kite set higher into the sky than a sail and therefore would give a smoother pull. Either of these methods could only be used when the wind is of appropriate velocity and direction. I am thinking here of desperate people in the future who have to get to the Eartharks without the use of modern high tech materials.
Davis Station to Earthark Mountain is about 1,600 kilometers. It is also about 1,600 kilometers to McMurdo and 2,000 kilometers to Halley. The Google Earth scan from Davis to Earthark looked the smoothest. McMurdo was next best after crossing the mountains which are near that starting point. Halley might be considered best for going to Noah or Hope. There are already some marked and traveled roads on the ice but not to where we want to go. When some isotainers are taken out to the Earthark sites there will be real experience with whatever difficulties will arise. The general level of difficulty shouldn’t change much even in a thousand years. So safe routes could be known and mentioned in the future Earthark literature. If really big kites could be used to pull the isotainers out to the Earthark sites those kites could be left there and used by the future people to pull them back to the ships at the ocean’s shore. The isotainers could even be specially designed to be water tight and seaworthy and toed back to distant places with the kites.
Because there is relatively little crossing of glacial-flow between Davis and Earthark there should be less problems with crevasses. Staying on the blue areas would be best and a good route would probably be departing from the Davis Station area away from the Amery Ice Shelf onto the deep purple zone toward Vostok and then heading straight for Earthark. It might work well to go directly to Vostok for a known stop over point and then to Earthark.