What is a GPX?
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  1. #1
    Charter Member
    us
    Jul 2015
    Near Ground Zero for Insanity
    XP Deus with HF/x35 Coils and Mi6 Pinpointer/ML Equinox 600/800/ML GPX 4800/Garrett ATX/Fisher F75 DST/Tek Delta/Whites MXT/Nokta Simplex/Garrett Carrot
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    All Types Of Treasure Hunting

    What is a GPX?

    Things just seemed lonely in this lil' subforum...
    Hobbs., Davers and RustyGold like this.
    "The future ain't what it used to be..."

  2. #2
    us
    Formerly Mach 1 Pilot

    Jul 2008
    Bedford County, PA
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    Funny! Especially knowing both that you have one and you know how to use it well.
    G.A.P.metal and Hobbs. like this.

  3. #3
    Charter Member
    us
    Jul 2015
    Near Ground Zero for Insanity
    XP Deus with HF/x35 Coils and Mi6 Pinpointer/ML Equinox 600/800/ML GPX 4800/Garrett ATX/Fisher F75 DST/Tek Delta/Whites MXT/Nokta Simplex/Garrett Carrot
    4,503
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    All Types Of Treasure Hunting
    Quote Originally Posted by Fort Bedford Detectors View Post
    Funny! Especially knowing both that you have one and you know how to use it well.
    Yeah, just trying to get some discussion going. Better than writing "Test".
    G.A.P.metal and Hobbs. like this.
    "The future ain't what it used to be..."

  4. #4
    us
    Aug 2010
    cameron,ok.
    whites tesoro
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    Is it a auto race in france
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  5. #5
    us
    Apr 2009
    Maryland
    Minelab CTX3030
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    Relic Hunting
    I came here to read some pointers especially with the upcoming DIV.
    Hobbs. and Oddjob like this.

  6. #6
    us
    Dan

    Feb 2016
    Petersburg Virginia
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    I've been thinking about getting one though they do cost a mint o' dough.
    Oddjob and Hobbs. like this.

  7. #7
    us
    Sep 2013
    Shenandoah Valley, Virginia
    GPX5000, AT Gold, AT Pro, Whites TDI, Bandido 2 umax, Tejon & Compadre
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    Quote Originally Posted by RiverRat3 View Post
    I came here to read some pointers especially with the upcoming DIV.
    Dig everything....miss nothing!
    Direct descendant of:
    Ezekiel Lamb 13th VA Inf. Co F, CSA
    Robert Wyant 33rd VA Inf. Co F, CSA
    Thornton Dean 10th VA Inf. Co I, CSA

  8. #8
    us
    Jan 2011
    Southern Kentucky
    30
    33 times
    Quote Originally Posted by Phishfarmer View Post
    I've been thinking about getting one though they do cost a mint o' dough.
    If you like to relic hunt then GET ONE you won't regret it. It kills on relics.
    Hobbs., Oddjob and Digger70pa like this.

  9. #9
    Charter Member
    us
    Nov 2012
    Maryland
    XP Deus, Tesoro Cibola, Full sized shovel and a backhoe
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    It loves nails too!
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  10. #10
    us
    Dan

    Feb 2016
    Petersburg Virginia
    Deus, Others
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    Relic Hunting
    I understand weight is a big issue with the GPX,, why hasn't someone made something to carry the heavier parts on your body and just have to swing the loop? I guess you have to listen to a threshhold/tone all the time with a GPX also?
    Hobbs. likes this.
    Dig it!

  11. #11
    Charter Member
    us
    Nov 2012
    Maryland
    XP Deus, Tesoro Cibola, Full sized shovel and a backhoe
    16,183
    29628 times
    All Types Of Treasure Hunting
    Banner Finds (8)
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    It's 'cause manufacturers don't listen to us little people.
    Hobbs. likes this.

  12. #12
    us
    Jan 2011
    Southern Kentucky
    30
    33 times
    Quote Originally Posted by smokeythecat View Post
    It loves nails too!
    If you learn the sounds you won't dig many nails like other pulse detectors. You'll always dig a few but you'll double and triple your civil war relic finds with a GPX!
    Hobbs., Oddjob and Digger70pa like this.

  13. #13
    us
    Old Tom Cat.

    Jan 2013
    N.of , I-285...GA
    Whites Spc xlt & Tesoro Tejon- Now back ...Fisher 1266-X. TRX Pointer. New .Teknetics G2 + . New AT Pro .
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    Lot's of helpful info , Guess ill try You-Tube.
    Thanks V-Magnum P.I. Car -Guy.
    Hobbs. likes this.
    As I am finding , In life we begin having the Blissful happiness & the Wonder & innocence of a Child, then fall Quickly, then spend the rest of our lives trying to reach that point where we began ,through Pleasure , Fame, & Materials but Only 'Through true faith in Jesus , can we find Prefect Happiness or true Meaning in our Short lives on this Beautiful Earth filled with both the Light of Pure goodness & The Darkness of Pure Evil. D.

    That Said, I judge No Man.
    Davers

  14. #14

    Aug 2012
    RD1000, GSSI Profiler EMP-400. GPZ 14 & 19
    4,331
    8985 times
    Quote Originally Posted by Phishfarmer View Post
    I understand weight is a big issue with the GPX,, why hasn't someone made something to carry the heavier parts on your body
    Radical Design out of the Netherlands has a harness called Geowalker Pro that works really well. I have seen smaller people use them, I have not used one my self, nor have I used the harness for my Zed.

    Radical makes many special purpose products for several companies and will even do one offs for private people. Highest level quality of products, but high prices too.
    Hobbs. and RustyGold like this.
    Quote Originally Posted by G.I.B. View Post
    I'm not an Idiot Whisperer. I can't help you any further with the math.

  15. #15
    Charter Member
    us
    Jul 2015
    Near Ground Zero for Insanity
    XP Deus with HF/x35 Coils and Mi6 Pinpointer/ML Equinox 600/800/ML GPX 4800/Garrett ATX/Fisher F75 DST/Tek Delta/Whites MXT/Nokta Simplex/Garrett Carrot
    4,503
    7319 times
    All Types Of Treasure Hunting
    Quote Originally Posted by Davers View Post
    Lot's of helpful info , Guess ill try You-Tube.
    Thanks V-Magnum P.I. Car -Guy.
    OK, then, here's some tips for the GPX relic hunter (I don't use GPX for prospecting and use it only in hot soil, so that is the basis for my "tips"):

    The Key to GPX is understanding what the settings do and getting it to run STABLE. This is highly dependent on what is going on around you and the site conditions, so I avoid use others recommended "settings" because they mean nothing if you do not know what the settings do to machine performance.

    This is how I approach my GPX setup for a hot soil relic hunt.

    1. Set up your front panel toggle switches correctly (these are based on the 4800):

    Search Mode - General (doesn't really matter these positions are just three slots where you can customize settings to your liking the only difference being in the default settings for some parameters)

    Soil Timings - Start out in Normal the more complex timings in Special and Enhance mode can be tried later.

    Coil/Rx - This just sets the which coil on a Double D coil is used as the receive coil. It has no effect if you are using a mono loop. I use Double D because the target will pinpoint at the center of the coil, the other settings will cause the target to pinpoint off center.

    Ground Balance - Tracking is too slow and can cause targets to disappear when trying to pinpoint them. Use fixed and periodically re-balance using the trigger button on the handle.

    2. LCD user user settings:

    Set Rx Gain at 8 and Motion on Medium for the following adjustments (if you use slow motion then you are locked into slowing the coil swing down, medium allows you to use a normal search swing and you can always slow your swing down to zero in on a target as necessary). I use NRM audio (not deep or boost) and all the other default audio, signal and target volume settings.

    3. Find a quiet channel. You can use AutoTune to do this (takes awhile) or dial it manually to a quiet channel. I like to use numbers well away from the default channel when hunting at sites with a lot of other GPX users. Typically a channel number less than 100.

    4. Adjust the threshold just high enough to know the machine is alive. Too high and you will miss the squeaker targets and too low you may not hear some faint targets. Again keep the machine running just on the edge of being completely quiet.

    5. Do a quick ground balance.

    6. Raise your coil in the air at this point and make sure it is on the edge of quiet and adjust threshold as necessary.

    7. Put your coil on the ground again and swing, GB as necessary by pumping while pressing on the trigger button. If noise doesn't decrease, something like Rx Gain, Threshold, or Receive Channel may still be off. Adjust as necessary.

    8. Leave stabilizer at the default. You can adjust it higher until you hear a change in the threshold and then back off one notch, but I just usually leave it alone.

    9. Setting Iron Reject - Too high and you will get blanking on good targets like minie balls so I recommend keep it at 7 max or less. Iron reject won't work on a mono coil.

    After you have your machine set up, then recognizing target audio is the key and that comes from getting out there swinging and digging.

    There are always exceptions to truisms like minie balls giving a nice smooth low tone with no blanking or buttons giving a nice sharp high tone. Or nails giving you a high tone warble if you swing along the length of a nail vs. swinging across the shank, etc. The best I can tell you is some good targets may sound like nails, some large iron makes good relics (bayonets and swords) and if you get a consistent signal from two 90 degree swings then dig it.

    HTH
    "The future ain't what it used to be..."

 

 
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