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  1. #1
    Join Date
    26th November 2009
    Posts
    4,907

    Exclamation Caution about tracking app "GPS Rocket Locator"

    Hey,

    Just a heads up on the Android app "GPS Rocket Locator". It's not an intrinsic problem
    with the app itself or a danger to one's device it's simply that Google maps don't work anymore.

    I received this reply from the author:

    "You are right. It doesnt work anymore...
    They probably changed the url for getting tiles. I dont know when i will have time to work on it. Im busy these times."

    I've asked if there is a way to set the default to OSM for new installs. I'll see what he says.

    If anyone has cached maps for off line use, be careful with your system because there isn't
    the means to restore for now.

    It was nice to see how close to a farm building or electric line or tree one's flight went but the OSM maps are adequate to plan a recovery. Sometimes it's easier to drive on road to a place where it's a shorter hike to pick up one's rocket. Kurt


  2. #2
    Join Date
    20th December 2011
    Location
    France
    Posts
    351
    well unfortunatly the software is not opensource so we cannot fix it .
    It is a shame because I know Android dev and I should have been able to help


  3. #3
    Join Date
    23rd July 2011
    Location
    Butte, MT
    Posts
    2,263
    If the path is stored as a string in the executable you may be able to simply use a binary editor and change it without needing source code. Of course it may be that it the code calculates a checksum to detect changes to its resources in an effort to be secure, but it's worth a shot.


    Steve Shannon
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

  4. #4
    Join Date
    26th November 2009
    Posts
    4,907
    I can't help you here because I'm just a script kiddie. The author's site is here with his contact address: http://rocketlocator.com/

    As he said, he's busy and doesn't know when he will be able to get at is. The Open Source Maps still cache properly and is still useful for
    planning recoveries in relationship to nearby roads (for us "flatlanders") In other places, an aerial map alerts one to geographic obstructions
    that may impede a recovery route. Nice to have but one can still get their rockert back nonetheless. Kurt

  5. #5
    Join Date
    30th October 2017
    Posts
    1
    It looks like this was fixed in August.

  6. #6
    Join Date
    26th November 2009
    Posts
    4,907
    Quote Originally Posted by donedvalson View Post
    It looks like this was fixed in August.
    Yup,
    It was fixed and documented in another thread. There were some open photomaps out there that are usable. Not the latest and greatest but certainly well enough for one to navigate around obstructions. Kurt

  7. #7
    Join Date
    11th February 2017
    Location
    south Florida
    Posts
    571
    Did the fix stop working? I just downloaded GPSRL for use with my new T3. Google Maps not working. Open Street Maps is working, but apparently no Satellite View. Is there a way to get Google Maps, or a way to get Satellite View with OSM?
    Thanks,
    Bill

    L1 3/25/17 H135
    L2 8/12/17 J180

  8. #8
    Join Date
    11th February 2017
    Location
    south Florida
    Posts
    571
    Never mind, I found another thread about this, apparently Google Maps stopped worked again on GPSRL on 11/22/17, see http://www.rocketryforum.com/showthr...ighlight=gpsrl.

    I'd really prefer a satellite view, is that available on either of the recommended Windows apps, Visual GPS and u-center Windows? I have a Windows tablet I could use.

    L1 3/25/17 H135
    L2 8/12/17 J180

  9. #9
    Join Date
    26th November 2009
    Posts
    4,907
    We're SOL concerning a photomap now. If one took the trouble to "wilfully" save the tiles, Better back them up.
    The ham radio app aprsisce/32 can be hacked tor use with NMEA trackers but the learning curve is very high.
    Kurt

  10. #10
    Join Date
    23rd July 2011
    Location
    Butte, MT
    Posts
    2,263
    Can you use the maps available from http://www.webgis.com/landsat.html?
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

  11. #11
    Join Date
    26th November 2009
    Posts
    4,907
    Quote Originally Posted by Steve Shannon View Post
    Can you use the maps available from http://www.webgis.com/landsat.html?
    I think that's what Mr. Lynn Deffenbaugh, KJ4ERJ does with aprsisce/32. That's my preferred app for tracking the NMEA trackers with a photomap for now. Was able to download various zoomlevels to memory of the sites I fly at. Those photomaps are
    a few years old (I'd guess maybe 3 to 5years on the closeup stuff) but still very serviceable for rocket flying.
    Aprsisce/32 one feeds the NMEA strings in one instance to track the rocket and use a second instance to take your local GPS position and "beacon" it through an internal network to the 1st instance once every 10 seconds. Both positions get plotted on the
    same map.

    Except I think there might be some latency issues and I am going to get my local position on the map before launch. Shut off the internal network so the 1st instance of aprsisce/32 isn't wasting time listening for the local "beacon" and then just track the rocket while in flight.

    That's what's important. Once the rocket is down, I'll fire up the 2nd instance to beacon the local position to the 1st instance a turn on the network monitoring in the 1st instance. That will get both icons, rocket and local position on the map. Sounds hard but it isn't really.

    I thought some rocket positions were missed on the map due to monitoring of the network but once the rocket is down, it's not that important and both instances can be used at once.

    I don't code so I don't know if GPS Rocket Locator could be modified to use the GIS tiles. I thought the code was put on Git-Hub so anyone could have a stab at it. When Francois "fixed it" the first time, I ran to a high speed link and
    downloaded my preferred launchsites and local areas at various zoom levels. Took a heck of a lot of time to back up but I still got 'em. I want to try GPSRL again with them.

    Alternatively, the "missed" positions from the EggFinders "could be" explained by the difficulty of decoding the positions because of the constantly changing position of the tracker antenna and hence the polarity of the radio signal
    when the tracker is "flopping around" under drogue. How to get around this? As Tim Taylor said, "More horsepower, argh, argh, argh!!" Indeed higher power can overcome some of the polarity mismatch as can a more sensitive
    or higher gain antenna like the patch antenna for the 900Mhz bands. I certainly noted more recovery of positions when using the "Patch on a pole": Click image for larger version. 

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    If one can blow their main up higher like 800 to 1000 feet the antenna position generally settles down into a vertical orientation and position recovery is improved I've noted. Also a higher altitude can lead to a better propagation to some
    degree and a drift pattern can be seen on the map, aprsisce/32 or GPS Rocket Locator. This can give one an idea of what direction to go if they get to the last known location and no rocket is seen.

    Kurt

  12. #12
    Join Date
    20th April 2012
    Location
    Fredericksburg VA
    Posts
    1,565
    Quote Originally Posted by Steve Shannon View Post
    If the path is stored as a string in the executable you may be able to simply use a binary editor and change it without needing source code. Of course it may be that it the code calculates a checksum to detect changes to its resources in an effort to be secure, but it's worth a shot.


    Steve Shannon
    Ah, reminds me of the good old days when I was an assembly language programmer and used to debug programs by patching the object code in machine language.
    NAR Level 3 #96210

  13. #13
    Join Date
    30th January 2016
    Location
    US > OK > NE
    Posts
    3,476
    Quote Originally Posted by Nathan View Post
    Ah, reminds me of the good old days when I was an assembly language programmer and used to debug programs by patching the object code in machine language.
    I'm sensing a trend in your skillsets here... next up, old master engraving! :-D

  14. #14
    Join Date
    23rd July 2011
    Location
    Butte, MT
    Posts
    2,263
    Quote Originally Posted by Nathan View Post
    Ah, reminds me of the good old days when I was an assembly language programmer and used to debug programs by patching the object code in machine language.
    Exactly. Twenty five years ago I bought a Micron Technology motherboard when the 486/66 first came out. It was the same motherboard that Gateway Computers used at the time, but I read that Gateway had issued an update to their BIOS that had fixed some things so of course I had to have it. I downloaded the bios patch and prepared to burn it, which was done by copying the bios code to the first sector of a floppy and booting tomfloppy. But I spotted a misspelling in the BIOS copyright notice. Two letters had been transposed, so I used a hex editor to swap them, thinking the CRC or checksum wouldn’t care. It wouldn’t boot.
    Nearly panicked I went into work and used debug to prepare a new floppy (with the misspelling) and retried it. Fortunately that worked, because it was an expensive motherboard.


    Steve Shannon
    Steve Shannon
    L3CC, TAP, Director, Tripoli Rocketry Association

  15. #15
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,562
    Quote Originally Posted by Steve Shannon View Post
    Exactly. Twenty five years ago I bought a Micron Technology motherboard when the 486/66 first came out. It was the same motherboard that Gateway Computers used at the time, but I read that Gateway had issued an update to their BIOS that had fixed some things so of course I had to have it. I downloaded the bios patch and prepared to burn it, which was done by copying the bios code to the first sector of a floppy and booting tomfloppy. But I spotted a misspelling in the BIOS copyright notice. Two letters had been transposed, so I used a hex editor to swap them, thinking the CRC or checksum wouldn’t care. It wouldn’t boot.
    Nearly panicked I went into work and used debug to prepare a new floppy (with the misspelling) and retried it. Fortunately that worked, because it was an expensive motherboard.


    Steve Shannon
    Back the the really good old days, there was no CRC on the object code... whatever you did stuck. Both a curse and a blessing... it did make it really easy to patch things by adding a JMP instruction and some NUL's, tacking your code to the end of the file, and ending it with a JMP back to the original "next instruction". Of course if you got it wrong you were completely foobed...


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