Welcome guest, is this your first visit? Click the "Create Account" button now to join.
Results 1 to 2 of 2
  1. #1
    Junior Member
    Join Date
    Jun 2012
    Rep Power

    Default Install a map to GPSmap 421s via SD card

    Hi Guys, im trying to complete the process of getting this map ([Only registered and activated users can see links. ]) unto my GPSmap 421. I purchased the map last week but i still havent arrived and we set sail tomorrow(

    Thing is that a lot of explanations around the internet confuses me, and i fail at the first step which is to find the SD card ID.

    I open the sd folder in my computer->tools->view->view hidden files and folder->view hidden systemfiles. Here i am SUPPOSED to find a file or folder named USBTRANS. But there´s no such file ( The card i use is a SanDisk Extreme 8 gb

    Either way. One of the other steps i am concerned about is where i put in the MAP Id; How do i know what MapId is right for my chart?

    another thing is that im supposed to put GPSMAPSUPP.UNL in a root folder, but the file i downloaded is a .IMG file.
    I tried to open the .IMG file in notepad but i got an error message which claimed that the file is to big for notepad to open...

    I know there´s a lot of tutorials out there but i found them all confused. If anyone can give me just a tiny bit of help, we would be forever grateful!

  2.    Advertissements

  3. #2
    Important User Install a map to GPSmap 421s via SD card p!xeldealer's Avatar
    Join Date
    Jun 2009
    Seven Seas
    Rep Power


    First of all the map that you have linked above as torrent is fairly old - you'd better take this: [Only registered and activated users can see links. ]

    Second: forget SD card ID, MapID, gmapsupp.unl etc.!

    You only have to unlock the downloaded img with unlocker like gimgunlock or unlocker alternative, which you can all find here in software section.

    ...may there always be one hand's breadth water beneath your keel JC shipwrecked




Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.