| http://www.w3.org/ns/prov#value | - dle relies on the ionosphere reflection at night and becomes more inaccurate; (4) Terrain Effect, whereby the direction of radio waves is altered when passing between water and land, especially if the waves intercept the shore line at 30?? or more; (5) Mountain Effect, whereby signals are altered as they reflect off mountains; and (6) Ore Deposits, which cause deflections.
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