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Thread: Gpsmap 296 & 396 basemap
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17th July 2026, 04:20 PM #1Junior Member
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Gpsmap 296 & 396 basemap
Hello all, posting from Portugal
After an intensive search in this good forum, I've managed to change the BASEMAP of both my GPSMAP 296 & my GPSMAP 396, from US to ATLANTIC, on yes, those VERY OLD devices without Mass Storage Mode.
I've used the Attalntik v2.0 for Garmin 66 file, the only one still available on the forum, as none of the other links work anymore.
Has anybody out there has a good source for ATLANTIC database v3.0 ?
Is anybody out there willing to share a memory region 3 DUMP from the ATLANTIC ROUTABLE HIGHWAY DATABASE v3.0 ?
Thanks in advance.
This post copied from [Only registered and activated users can see links. ] to allow assistance in more appropriate section.
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18th July 2026, 02:45 PM #2Member +
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Last edited by Alfiogigio; 18th July 2026 at 05:03 PM.
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19th July 2026, 01:11 AM #3Garmin/GPS Systems GMod.
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@CitabriaPT
To properly convert the IMG file kindly supplied by Alfiogigio to an RGN file, see this thread: [Only registered and activated users can see links. ].
Because RGN_Tool cannot cope properly with conversion of an IMG file (renamed to a BIN file) into an RGN file, you must modify it in a Hex Editor as explained in that thread .... Or just use gfw.exe which can handle the conversion correctly.
PS & OT: Do you really own a Citabria? (Airbatic).'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
[Only registered and activated users can see links. ] should make their first post as a new Intro Thread in [Only registered and activated users can see links. ].
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Today, 05:18 PM #4Junior Member
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Hello All
Recent updates on Atlantic Routable Highway Basemap v3
Converted the basemap file gmapbmap.img to gmapbmap.rgn using makergn.exe tool as instructed by Neil on previous post.
Region 3 used for basemap.
Renamed the file 026001000611.rgn for Garmin GPSMAP 296
Renamed the file 040201000571.rgn for Garmin GPSMAP 396
Used updater.exe to upload each file to each GPS (same updater used to update firmware, thus the file rename) and...
SUCCESS: Now I have the ATLANTIC ROUTABLE HIGHWAY v3 on both GPS.
Now it's time to try that on my airplane, a 1969 Citabria !
Thanks Alfiogigio, Thanks Neil.
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Today, 05:29 PM #5Junior Member
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Hello All
Next task it to try to recover my spare Garmin GPSMAP 296 Splash Screen:
Main issues started when using xImage on a spare 296, to change the splash screen to a custom BMP of (yes!), my Citabria aircraft.
xImage quit mid-operation, I manually rebooted the 296 to find only half Splash Screen with half photo of aircraft, half blank. so I tried xImage again, with same BMP I’ve used 10 years ago, seemed to uploaded correctly, but when I reboot the 296, just a black screen shows up, no Splash anymore. retried xImage, but gives me error every time, with the correct BMP sizes (uploaded the same BMP to a 396 OK), it dowloads any screen shot OK, updates waypints images, but does not update Splash screens.
Suspect some damage was done to internal memory, or some address wrongly written and now xImage cannot access that region to write (gives erro saying image is not of correct size, BUT IT IS); If I try to READ the Splash Screen from the GPS, it freezes, only rebootable by taking the battery out.
GPS works great, boots with a blank screen, or with a blank with the text I write on settings, but no Spash Screen image.
So after some internet search I’ve ended in this GREAT forum, and really learned a lot.
Intentions now are to get my plane’s 296 home, backup/dump region 03 to have Atlantic v.1 backup, dump region 16 (hex 0x10) and try to upload the backed-up region 16, to the spare Splash-missing 296.
Any help from you guys would be highly appreciated.
I'll let you know how it went
Regards,
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Originally Posted by CitabriaPT
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