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Tim

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Tim
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  • (Which) External antenna for Garmin GPSmap 64s?

    I'm going to disagree a little bit with what has been said. While the antennas (perhaps more accurately called receivers) inside a GPS are very sensitive, they are not very large. They don't have a very big net to capture the signals. While they might be sensitive to detecting weaker signals they don't necessary do a great job of capturing weak signals.

    GPS is essentially a radio broadcast your GPS receiver listens to, very similar to FM or AM radio. FM radio operates at 88 - 108 MHz while GPS operates up near 1100 - 1600 Mhz. Recall old radios with telescoping antennas and how much of a difference extending the antenna can make.

    An external antenna will help in a similar fashion. It isn't that the external antenna in a different location than the GPS (with exception for the scenario noted above where the GPS is blocked inside something like a car) but that the antenna is longer and larger and thus is able to cast a bigger net to catch more signals.

    The big, blocky antennas on older GPS devices helped cast a bigger net when the receiver chip wasn't as good at picking out weaker signals. As the chips became more sensitive the bulky antennas were no longer necessary and wen't out of style. But they are still useful in casting a bigger net.

    Don't get me wrong, I don't think it will make a huge difference, but an external antenna does provide more of an advantage of simply putting the receiver in a different location.
  • Route Efficiency

    Any GPS can of course produce strange routes from time time. The two major factors are (1) the accuracy of the underlying map data and (2) the strength of the routing algorithm.

    As for map accuracy, this will vary from location to location so it is difficult to say which might be better for you without people having local knowledge of both maps. (Difficult to find.)

    As to routing quality beyond the extent of the underlying map data, manufacturers need to balance the expense of faster processor speeds and the patience of people waiting for the GPS to calculate a route in addition to just having route smarts. A GPS won't consider all route possibilities and the more shortcuts it looks for the longer route calculation will take... so at some point the GPS just spits out the best route it has found, which isn't always the best.

    In my years of experience with multiple brands across different parts of the country I'd give a slight edge in map accuracy to the maps Garmin licenses from 'Here' while at the same time giving an edge to TomTom when it comes to smart routing algorithms.
  • GPS Rec for Hunting land - mapping trails and measuring area of food plots

    I'm not sure you'll find a recreational GPS that does the area calculations, but I may quite be wrong on that.
    Actually, quite a few will. The DeLorme models will as will many Garmin models:
    How do I locate and perform an area calculation on my GPS?
  • GPS Blind people

    @ddabcd277 no consumer GPS has that accuracy. They will get +/- 10 meters 95% of the time and +/- 5 meters most of the time. But 3 meters... not going to happen with any consistency.
  • When is the next Garmin map update? (Latest Map Version)

    I am going to keep this thread clean of replies and just put the relevant info in this post. You can reply with new dates and versions, but put questions, commentaries in other threads or create a new thread. These dates refer to the North America map only.

    2019

    Best Guess: May 22 (Wed), 2019 : 2020.20
    Current ----> Jan 30 (Wed), 2019: 2020.10

    2018

    Nov 7 (Wed), 2018: 2019.30
    Jun 20 (Wed), 2018: 2019.20
    Apr 4 (Wed), 2018: 2019.11
    Jan 24 (Wed), 2018: 2019.10

    2017

    Oct 11 (Wed), 2017: 2018.30
    May 18 (Thu), 2017: 2018.20
    Jan 19 (Thu), 2017: 2018.10

    2016

    Oct 05 (Wed), 2016 2017.30
    May 18 (Thu), 2016 2017.20
    Jan 27 (Wed), 2016: 2017.10

    2015

    Oct 14 (Wed), 2015: 2016.20
    Jul 29 (Wed), 2015: 2016.10
    Mar 24 (Tue), 2015: 2015.40

    2014

    Nov 12 (Wed), 2014: 2015.30
    Aug 13 (Wed), 2014: 2015.20
    May 15 (Thu), 2014: 2015.10
    Feb 5 (Wed), 2014: 2014.40

    2013

    Nov 20 (Wed), 2013: 2014.30
    Aug 21 (Wed), 2013: 2014.20
    June 12 (Wed), 2013: 2014.10
    Feb 21 (Thu) 2013: 2013.40

    2012

    Oct 31 (Wed) 2012: 2013.30
    Aug 16 (Thu) 2012: 2013.20
    May 9 (Wed), 2012: 2013.10
    Feb 7 (Tue), 2012: 2012.40

    2011

    Nov 9 (Wed), 2011: 2012.30
    Aug 4 (Thu), 2011: 2012.20
    May 18 (Wed), 2011: 2012.10
    Feb 16 (Wed), 2011: 2011.40

    2010

    Nov 11 (Thu), 2010: 2011.30
    July 28 (Wed), 2010: 2011.20
    Apr 21 (Wed), 2010: 2011.10
    Jan 21 (Thu), 2010: 2010.40

    2009

    Nov 19, 2009 (Thu): 2010.30
    July 30, 2009 (Thu): 2010.20
    Apr 8, 2009 (Wed): 2010.10
    Jan 22, 2009 (Thu): 2009

    I am going to keep this thread clean of replies and just put the relevant info in this post. You can reply with new dates and versions, but put questions, commentaries in other threads or create a new thread. These dates refer to the North America map only.