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  1. #11
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    Hello guys, my first time here on the forum. I have a garmin gpsmap 188c new out of the box a week ago. Theres a strange problem on it, the garmin datacard wont read on it, it says loading maps for hours, if i remove the card it will work, but not with card inserted. i have tried 6 different cards and also update cards and empty cards. I guess the unit is broken, which is weird since it has newer been out of the box. I`ve tried firmware update and downgrade via serial but it wont work. Anyways I am now trying to install a bluechart marine map replacing the basemap but i am a bit stuck. i`ve tried the guide here for the garmin 278 but it doesnt seem to work with my unit. when i try to write the file to rgn=49 it says that it cant write to that memory area, if i try rgn=3 it says invalid command syntax. does anyone here know a way around? i appreaciate all the help i can get. thank you.

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  3. #12
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    If an empty datacard or one without a valid map or chart is inserted in some older units they will endlessly try to read the [nonexistent/invalid] img file i think.

    I've not laid hands on a 188C sounder but i'm guessing that they don't have a detail map in the internal memory, in other words they don't have region 49 [0x31] at all. See Post #7, other similar units have region 10 [0x0A] reserved for gmapsupp.img in a Garmin folder on the datacard so you could just copy an image there using a datacard writer if you have access to one. Otherwise, the WebUpdater method from post #1 should work substituting '10' for '49', see here: [Only registered and activated users can see links. ]. It that won't work, you can save it as an RGN file and flash it to region 10, using this method to create an rgn file from a *.img map file before flashing it:

    ⦁ Change the extension name of the selected *.img file to gmapsupp.bin
    ⦁ Open gmapsupp.bin in RGN_Tool
    ⦁ Save as gmapsupp.rgn
    ⦁ Open gmapsupp.rgn in a hex editor
    ⦁ Search for 'R' in plain text or first instance of '52' in hexadecimal, typically 'R' is at offset 0x31 and '52' is followed by '33'
    ⦁ Change 33 to 0A [at offset 0x32 typically]
    ⦁ Save the changes and then flash the RGN file using Updater.exe.

    Or do it easily using kunix's makergn.exe to make the RGN file with the correct region:
    Code:
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    I think it would be most unwise for you to overwrite the preloaded basemap with any other type map or chart other than a dedicated and appropriate basemap. Using the WebUpdater method doesn't work for other units to write to region 3 anyway, see post #6. It's possible to replace the basemap with an image flashed as an RGN file via Updater.exe but as i said you'd best not write a detail map to region 3 [0x03] EVER.

    Of course if you have a PC Install Version of the chart [rare these days] you can easily transfer all or parts of it to the datacard using MapInstall.
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  4. #13
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    Hi Neil, thank you for taking your time to answer my questions. I actually do have a cd with mapsource and unlock code for my region. The map on the cd is a bit dated but the accuracy and detail for my area is very good. I also have a data card reader/writer and I have tried to download maps from mapsource directly on to the card. I have also created an update card from garmins website with the latest firmware for the device. the 188c wont read any of the cards I have created, not even the firmware update card for that specific device. If I insert the card after the device is on, nothing happens.. If I insert it before powering it on it just sits there trying to read the card for hours. I tried the guide you included in your response describing how to write to region 10 (data card) via serial, but webupdater says it cant write to the requested memory area. Although when I send the command to write to region 10 the device shows a message on the screen that it is transmitting data, but that message comes up on the screen even without a data card inserted and nothing really happens with or without a datacard. I have tried the data card created on mapsource on a device my friend is using, the exact same model, and it works just fine on his device. Thank you for all your help Neil.

  5. #14
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    It seems the datacard reader of the 188C is indeed somehow at fault in that case. You could try cleaning the contacts of the card slot with some very small amount of dedicated electrical contact cleaner in case they are corroded or just a bit dirty. If its connections to the board are physically broken it would involve disassembling the device and reflowing the solder connections, that's quite an expert job. Or the fault could be on the board itself too. Bad luck in that case mate!
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  6. #15
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    I figured as much, thank you for your insights into this. If I manage to get it to work I will post an update.
    Take care and greetings from Norway! :-)

  7. #16
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    I have a GPSMap 478 I'm trying to update. I have a good, unlocked gmapprom.img ready. Although, I do not know the size I can use? Anyone have any insight? Also, do I use 77 instead of 39? Can I upload maps in both areas?

    Thanks for the help. This is my first post!

  8. #17
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    G'day JumpJunky, welcome to GPS Power mate.

    If you read Post #10 carefully, much of what's applicable to marcovitch's European GPSMAP 278 is the same in your GPSMAP 478. To help you further we'd need more info on what you want to do. I guess you want to replace one of the existing preloaded land or marine maps, on the internal memory? What do you mean by "use 77 instead of 39?". Do you mean region 49 where the primary map is stored?

    Best dump both regions 49 and 77 using GPSDaemon to check what's presently loaded there and confirm their sizes as reported in Post #2.
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  9. #18
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    Quote Originally Posted by Neil View Post
    G'day JumpJunky, welcome to GPS Power mate.

    If you read Post #10 carefully, much of what's applicable to marcovitch's European GPSMAP 278 is the same in your GPSMAP 478. To help you further we'd need more info on what you want to do. I guess you want to replace one of the existing preloaded land or marine maps, on the internal memory? What do you mean by "use 77 instead of 39?". Do you mean region 49 where the primary map is stored?

    Best dump both regions 49 and 77 using GPSDaemon to check what's presently loaded there and confirm their sizes as reported in Post #2.
    Thank you for the reply. I'm looking to update the NA City Navigator 2012.1 with an updated version. Since 2012, the maps have grown in size significantly, so I want to verify the space I have before updating.

    Yes, I meant 49, not 39 - typo.

    I'll check out GPSDaemon and verify what's in those areas. Thanks again!

  10. #19
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    OK - got maps loaded in both areas. However, the names in the menu are portions of the map, rather than the whole mapset name. Since I couldn't add the whole North America map, I selected east of the Mississippi. So, the map "name" in the menu are some state names, rather than "City Navigator 2017". Not a big deal, but can this be addressed?

    I'm still trying to figure out how to use GPSDaemon. Is it a Linux program?
    Last edited by JumpJunky; 13th November 2016 at 17:09.

  11. #20
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    Quote Originally Posted by JumpJunky View Post
    OK - got maps loaded in both areas. However, the names in the menu are portions of the map, rather than the whole mapset name. Since I couldn't add the whole North America map, I selected east of the Mississippi. So, the map "name" in the menu are some state names, rather than "City Navigator 2017". Not a big deal, but can this be addressed?
    The map name can't be changed 'on-board' because you have no PC Mass Storage Mode available in your 478, so you'd need to dump the regions to hex/bin files using GPSDaemon, change them to img files, change the inconvenient naming in GMapTool or IMGTool and then reload the files back to the device. All too much trouble for such a minor inconvenient imho.

    I'm still trying to figure out how to use GPSDaemon. Is it a Linux program?
    It's a Windows program. Instructions for dumping are in [Only registered and activated users can see links. ].
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