GPS - What features do you get with the more expensive models?

monikaperrymonikaperry Global Mapper UserPosts: 1
edited July 2011 in GPS Features
I've been looking at GPS systems and cannot figure out why the price different so much between different models.

Comments

  • Alex404Alex404 Global Mapper User Posts: 24Trusted User
    edited April 2011
    Electronic compass, barometer, camera, touch screen, large screens, brilliant displays, water resistance, internal GB of memory, SDHC card slots, external antenna adapters, pre-loaded maps, geo-tagged pictures, videos and voice memos, geocaching abilities...

    ...tha should mainly be it..

    Best regards,
    Alex
  • DC KelleyDC Kelley Global Mapper User Posts: 77Trusted User
    edited July 2011
    I've been looking at GPS systems and cannot figure out why the price different so much between different models.

    10cm accuracy anywhere on the face of the earth in 10 seconds and
    <1.0mm accuracy in 100 seconds while stationary

    L1, L2 and L3 signal tracking, both code and carrier, GPS plus others
    = ~$12k and a live RTK grade DGPS source.

    versus

    20meter accuracy, ~3 seconds latency, while moving, and many failure points.
    L1 signal tracking only (sometimes low end will have a carrier track)
    GPS only, no DGPS but can often accept it
    = ~<$50 OEM cost

    The first is what a survey crew typically buys.
    The second is what a consumer products has in it.
    The 1:250 difference in price is the cost to be further up the food chain. Keep in mind that the "consumer" grade device above cost the US gov $48k a copy 25 years ago.

    Of course with a consumer grade device you have a display and need to buy off Navtech (a major navigation map vendor) and other components to build a complete product as well.

    If you are buynig this as a personnel nav toy, accuracy will not be a concern to you, if you want to "locate" things you need to ask yourself more about what would be good enough for your needs. Good luck.
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