Modern Navigation (17 pages)

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Modern Navigation

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Pages:
17
School:
Massachusetts Institute of Technology
Course:
12 215 - Modern Navigation

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12 215 Modern Navigation Thomas Herring tah mit edu http geoweb mit edu tah 12 215 Today s class Basics of Handheld GPS Run through typical screens that are available in handheld GPS Navigation screens Tips on using this type of GPS 12 09 2009 12 215 Lec 22 3 Garmin Receivers This is the brand we will use in our field trip next week At left is the Garmin V we will also use a Garmin III Both receivers work either in portrait or landscape mode Set by pressing and holding the page button 12 09 2009 12 215 Lec 22 4 Basic Screens Start up screen when receivers starts The satellite constellation it shows depends on the last almanacs that we downloaded and where it thinks you are located Pressing menu allows user to graphically select location Height of bars denotes signal strength and solid bars indicate that the satellite can be used for positioning i e the ephemeris for the satellite has been downloaded 12 09 2009 12 215 Lec 22 5 Map screens Page and quit cycle through the screens After the receiver has locked up on satellites and has a position the map screen appears The menu button allows the features of the map to be changed The screen below is when the receiver is in navigation mode and is given directions on where to go When you get close to a turn the map changes to a detailed view of the turn In and Out control the zoom on map 12 09 2009 12 215 Lec 22 6 Map step up screen The map setup screens allow of great deal of control of the appearance of the maps The top menu line moved with the rocker pad lets different parts of the map be changed 12 09 2009 12 215 Lec 22 7 Position page This page displays basic position and motion information The bearing shown is the direction of motion relative to true North When not in motion the bearing has no meaning in this receiver Other models has built in compass which will show a direction that receiver is pointing Magnetic bearings can be calculated with out the compass using a built in model for the magnetic field 12 09 2009



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