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One fundamental limitation of GPS is that receivers require an unobstructed view of the sky, so they only can be used outdoors. Even then, they often don''t operate well within forested areas or near tall buildings. GPS operations also depend on an accurate time reference, which is provided by atomic clocks at the U.S. Naval Observatory. Each GPS satellite has atomic clocks on board.Thus, each GPS satellite transmits data indicating its present location and the current time. All GPS satellites synchronize operations so that these repeating signals are transmitted at the same instant. The signals, moving at the speed of light, mobility arrive at a GPS receiver on the ground at slightly different times because scooter some satellites are farther away than others.

While the new units are an evolution of gen-sets Magnum had previously built for United Rentals and other customers, "these are totally new packages," said Roberts. "They have a totally new design of corrosion-resistant aluminum enclosure with our own enhanced digital controller."There are 11 models in the range, all powered by liquid-cooled diesel engines, which drive Marathon brushless alternators. The MMG12 (12 kW) and MMG25 (21 kW) are powered by Isuzu three- and four-cylinder naturally aspirated engines. The rest of the line, powered by four- and six-cylinder John Deere turbocharged diesel engines, includes the MMG50 (43 kW), MMG70 (62 kW), MMG85 (76 kW), MMG110 (96 kW), MMG125 (108 kW), MMG155 (135 kW), MMG180 (155 kW), MMG230 (201 kW) and MMG425 (371 kW. All of the engine packages include cooling systems from Diesel Radiator, Enginaire air cleaners and Nelson exhaust systems.

Harvey says the major contaminants they have found are rust and dirt, as well as water and algae. "Algae is actually our biggest problem. It lives on water in the fuel and results in a dark-purplish sludge in the tank."Most of the tanks we cleaned are used for irrigation," adds Harvey. "That means they sit out in the middle of a field all year. The exposure to dirt and condensation is probably greater than with a tank sitting at the farmstead." In both of these efforts, the tanks were cleaned by using a Cim-Tek VII fuel recycling system. Country Energy has helped make these units available to local cooperatives through their KleanSweep program. Fuel is pulled from the bottom of the tank by a suction wand and circulated through a screen and filter element with a 10micron particle rating. Cleaned fuel is then returned to the storage tank.