What are your expectations for a GPS?

Discussion in 'General GPS Discussion' started by JohnnyBib, Feb 18, 2016.

  1. JohnnyBib

    JohnnyBib

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    What kind of expectations do you have for smaller GPS modules like this (http://www.waveshare.com/uart-gps-neo-7m-c.htm)?
    Expectations such as:

    GPS lock speed from cold, warm,or hot
    Non-optimal condition connectivity (Cloudy, under trees, indoors)
    Accuracy for longitude, latitude, altitude, and speed

    And anything else you normally test for.
    Any input is greatly appreciated :)
    Thanks!
     
    JohnnyBib, Feb 18, 2016
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  2. JohnnyBib

    Nuvi-Nebie Moderator

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    Nuvi-Nebie, Feb 20, 2016
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  3. JohnnyBib

    JohnnyBib

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    Thanks for the info. I don't have much experience with GPS so I was wondering if it is expected that they work decently well indoors, and in places with obstructions such as trees and buildings.
    I am planning on using this model in a product that I will be selling so I wanted to get a feel of what a customer/user's expectation of the functionality of a GPS would be.

    From my testing so far it doesn't work too well indoors, and can be inconsistent in areas with buildings and trees.
     
    JohnnyBib, Feb 22, 2016
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  4. JohnnyBib

    Nuvi-Nebie Moderator

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    Expectations have definitely improved over the years, the first GPS I owned some 20 years ago definitely did not work in doors at all, by adding another set of satellites, EGNOS / WAAS, parallel satellite tracking and much more sensitive receivers, this has changed somewhat, however although it is sometimes possible to maintain multiple satellites when sitting in-doors and 12 feet from a window, it is still very difficult to get an initial 'fix' when in-doors and you should not expect this. GPS's still require direct 'line-of-sight' of multiple satellites to guarantee an 'initial fix' and your customers should not be expecting anything from in-door use. Devices that say they can navigate in-doors usually rely on a 'last known GPS' position and then use dead reckoning in the device (accelerometers, movement sensors etc.).

    I would say that your findings are normal and what you should expect, i.e. you won't get be able to improve the performance without using a very much more expensive and bulky unit
     
    Nuvi-Nebie, Feb 22, 2016
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    JohnnyBib likes this.
  5. JohnnyBib

    JohnnyBib

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    That's good to hear.
    Thanks so much for your help!
     
    JohnnyBib, Feb 22, 2016
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