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Help!! GPS illiterate

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  #8  
Unread 02-01-2013, 08:50 PM
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Re: Help!! GPS illiterate

I think you are making things much more complicated that necessary, regardless of the direction he wants to set up his range. All he really needs to do is set a waypoint on his GPS where the shooting bench will be. Then by going out to an approximate distance where his first target will be and hitting the "Go To" function he will know if he needs to go a little further out or come in a little until the distance is what he wants. Then he can set that spot as his next waypoint and keep right on doing that all the way out to infinity if he wants to. Most of the units will be accurate within 12-15 feet with WAAS enabled and that should be close enough for what he wants to do.
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  •   #9  
    Unread 02-02-2013, 11:17 AM
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    Re: Help!! GPS illiterate

    Topgun- That's sorta how I thought it would work. Many thanks.

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      #10  
    Unread 02-02-2013, 11:50 AM
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    Re: Help!! GPS illiterate

    Ok I guess I must be gps illiterate also what is WAAS?
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      #11  
    Unread 02-02-2013, 12:26 PM
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    Re: Help!! GPS illiterate

    Somewhere in most GPS setups there will be a function to either turn WAAS on or off on the unit. Anyway, here is the explanation to get better accuracy out of almost any GPS.







    Wide Area Augmentation System

    From Wikipedia, the free encyclopedia

    Jump to: navigation, search
    "WAAS" redirects here. For other uses of the acronym "WAAS", see WAAS (disambiguation).

    FAA WAAS logo




    WAAS system overview



    The Wide Area Augmentation System (WAAS) is an air navigation aid developed by the Federal Aviation Administration to augment the Global Positioning System (GPS), with the goal of improving its accuracy, integrity, and availability. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including precision approaches to any airport within its coverage area.[1]
    WAAS uses a network of ground-based reference stations, in North America and Hawaii, to measure small variations in the GPS satellites' signals in the western hemisphere. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.
    The International Civil Aviation Organization (ICAO) calls this type of system a satellite-based augmentation system (SBAS). Europe and Asia are developing their own SBASs, the Indian GPS Aided Geo Augmented Navigation (GAGAN), the European Geostationary Navigation Overlay Service (EGNOS) and the Japanese Multi-functional Satellite Augmentation System (MSAS), respectively. Commercial systems include StarFire and OmniSTAR.
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      #12  
    Unread 02-02-2013, 12:59 PM
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    Re: Help!! GPS illiterate

    Quote:
    Originally Posted by Topgun 30-06 View Post
    Somewhere in most GPS setups there will be a function to either turn WAAS on or off on the unit. Anyway, here is the explanation to get better accuracy out of almost any GPS.







    Wide Area Augmentation System

    From Wikipedia, the free encyclopedia

    Jump to: navigation, search
    "WAAS" redirects here. For other uses of the acronym "WAAS", see WAAS (disambiguation).

    FAA WAAS logo




    WAAS system overview



    The Wide Area Augmentation System (WAAS) is an air navigation aid developed by the Federal Aviation Administration to augment the Global Positioning System (GPS), with the goal of improving its accuracy, integrity, and availability. Essentially, WAAS is intended to enable aircraft to rely on GPS for all phases of flight, including precision approaches to any airport within its coverage area.[1]
    WAAS uses a network of ground-based reference stations, in North America and Hawaii, to measure small variations in the GPS satellites' signals in the western hemisphere. Measurements from the reference stations are routed to master stations, which queue the received Deviation Correction (DC) and send the correction messages to geostationary WAAS satellites in a timely manner (every 5 seconds or better). Those satellites broadcast the correction messages back to Earth, where WAAS-enabled GPS receivers use the corrections while computing their positions to improve accuracy.
    The International Civil Aviation Organization (ICAO) calls this type of system a satellite-based augmentation system (SBAS). Europe and Asia are developing their own SBASs, the Indian GPS Aided Geo Augmented Navigation (GAGAN), the European Geostationary Navigation Overlay Service (EGNOS) and the Japanese Multi-functional Satellite Augmentation System (MSAS), respectively. Commercial systems include StarFire and OmniSTAR.
    30-06
    Thanks, I guess I'm on a search through my gps now, hope I don't get lost on the way
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      #13  
    Unread 02-27-2013, 12:33 AM
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    Re: Help!! GPS illiterate

    First post here, so I hope I'm welcome.

    I've been using GPS's since the very first civilian Magellan came out. I became kind of a GPS geek I guess and have ended up as an instructor for sheriff depts, search and rescue squads as well as a few corporations.

    All of the info posted so far is correct. The WAAS system has increases the accuracy. If you have a screen showing active satellites most units will show you the WAAS satellite location as well. I do like setting the unit up on the WGS-84 grid because this compatible with Google Earths coordinate system. I like setting the coordinates to read in Decimal Degrees because this makes it much easier to input not only in map programs but is also the only one you can easily use in Excel.

    Saving a waypoint of your shooting bench is the first step. Proceed on out to where you want to set up your targets and go-to your saved bench waypoint and it will give you straight line of sight accurate to within 15'. Just make sure when doing this for accuracy you have optimal sat coverage at the time, it does change constantly.

    The worst piece of info off a GPS is elevation. Think about standing in an egg with 15' out to the shell. The narrow pointy end of the egg is above your head and may be off by as much as 100'+.

    Make any sense? Hope so
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      #14  
    Unread 02-27-2013, 03:26 AM
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    Re: Help!! GPS illiterate

    I'm like the other guy, past about 200 yards my Garmin measures in .1 mile increments. A tenth of a mile is 528 feet or 176 yards. That means your target range can be off by plus or minus 175 yards, or up to 350 yards. I can guess closer than that. Am I figuring that right?
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