Comparing Loran-C and GPS Navigation Systems

explanatory Essay
1473 words
1473 words

Electronic navigation systems are presently a very significant component of marine, land and aeronautic navigation as a result of their important role in ensuring safe navigation. Navigation is according to Oxford Dictionaries (n.d.) “The process or activity of accurately ascertaining one’s position and planning and following a route”. They help navigators to locate their positions in land, sea and air. In marine navigation, there are many types of navigation systems were used by mariners. Some of them are land- based navigation systems such as Loran- C, Decca and Omega. Others are satellite- based navigation systems like GLONASS, GALILEO, and GPS (Anwar, 2006). This essay shall compare between Loran- C and GPS navigation systems to prove that GPS navigation system is better than Loran-C navigation system. The comparison will be between the two systems accuracies, errors effects, coverages, dependence and independence of weather conditions and finally their ability to restore data but before that a brief idea about how these systems work and their importance will be provided. The Loran-c is a radionavigation system (called also a hyperbolic navigation system). It was developed from a previous hyperbolic navigation system called Loran A. Loran stands for Long Range Navigation. However, Loran-C has lower frequency pluses than Loran A which made it more accurate (Bowditch, 2002). Loran-C task is determining ships and airplanes positions using low-frequency pulses transmitted from land-based transmitters. The pulses are then received by receivers on ships and airplanes helping to determine their positions in either time difference or longitude/latitude (Tetley et al, 2001). The hyperbolic system (Loran-C) utilise two lines of position... ... middle of paper ... [Accessed 16th April, 2014] Navigation Center (2012). Loran-C general information [online] Available at: [Accessed 16th April, 2014] Oxford Dictionaries (n.d.). Definition of navigation in English [online] Available at: [Accessed 16th April, 2014] Proc, J. (2006). Loran-C transmitters & coverage [online]. Available at: [Accessed 16th April, 2014] Sweet, R.J. (2011). GPS for mariners. 2nd ed. London: McGraw-Hill Tetley, L. and Calcutt, D. (2001). Electronic navigation systems. 3rd ed. Oxford: Butterworth-Heinemann The Library of Congress (2011). What is a GPS? How does it work? [online] Available at: [Accessed 16th April, 2014]

In this essay, the author

  • Explains that electronic navigation systems are a significant component of marine, land and aeronautic navigation. they help navigators locate their positions in land, sea and air.
  • Describes loran-c as a radionavigation system (also called hyperbolic navigation system). it is based on low-frequency pulses transmitted from land-based transmitters.
  • Explains that gps is a radionavigation system like loran-c, but it's based on satellites not on land transmitters.
  • Explains that the loran-c has the ability to determine the actual two dimensional position of a receiver with an accuracy of 135-463 metres.
  • Explains that loran-c system positioning accuracy is affected by many factors. the magnitude of any error is measured in time difference error.
  • Explains that there are also errors in the gps system like the loran-c and any other navigation system, but the total error produced by a combination of all error producing factor is small.
  • Explains that loran-c transmitters cover many parts of the world, but it does not have a world-wide coverage. the gps navigation system is able to determine the positions of its users anywhere in the globe.
  • Explains that the loran-c can provide positioning services in any weather, while the gps is also working in all-weather, according to the library of congress.
  • Explains that gps receivers are able to supply its users with information about arrival time, distance, bearing, and position storing ability. loran-cs can store waypoints, which can help navigators in their navigation.
  • Compares the accuracy of the gps and loran-c systems. both systems have global coverage and are affected by extreme weather conditions.
  • Cites anwar, n. (2006). navigation advanced: mates/masters. west lothian: witherbys seamanship international.
  • States husick, c. (2009), halique, a. (2011), navbasics: watchkeeping & electronic navigation.
  • Cites navigation center (2012), oxford dictionaries (n.d.), definition of navigation in english, and proc, j. (2006).
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