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Earle , the marine biologist , said that the greatest threat facing the islands today comes from commercial fishing , particularly the practice known as longlining which strings baited hooks along the ocean for distances as long as 80 miles ( 130 kilometers ) . Because different soils have different filtering abilities , standards for well depths and for distances between wells and contaminants cannot guarantee a safe well . Such processes have now begun for distance education ( Note 36 ) . One resulted in an ongoing relationship between the University of Maryland University College and the University of Oldenburg in Germany to offer a graduate program for distance education professionals . In the models I am familiar with , the target can be most reflective surfaces or objects ( for distances of two to about 750 m ) , but use of a reflector can extend the range to about 5,000 m. Because of the clock speed of the devices , they have more limited distance accuracy than EDMs ( + / - 15 cm ) , but produce distance readings almost instantaneously . Irrawaddy dolphins sometimes spit water while feeding ( they can expel water from their mouths for distances of up to 1.5 m ) , apparently to herd fish . The GEMINI website is also being used to convey Kansas Geological Survey research results , serving as a platform for distance learning and technology transfer . The caller can stand at the other end of the gymnasium or track for a short run or for distances can run behind , beside , or in front of the runner holding a bell , keys , or using verbal instruction . During this seminar , participants will learn how to design performance-based telelessons ; how to think visually ; present with impact ; plan a telelesson that maximizes student-centered learning ; how to modify courses for distance learning and how to involve students at remote field sites .