AT5 File Extension
Lowrance Map Format
What is a AT5 file?
Lowrance Map Format, identified by the AT5 extension, is a GIS Files type and includes 247 files.
The Lowrance Map Format (AT5) was created by Lowrance, a company that developed file format and produced 2 programs for their use.
AT5 files are compatible with various operating systems, including Windows. If you need to open a AT5 file, you can use one of 2 programs, such as MapCreate and NauticPath.
How to open a AT5 file?
If you’re having difficulty opening a AT5 file, it is often due to not having the correct software. To solve the problem, choose a compatible program from the list. Then follow the link to the official developer site, download the software, and install it on your device.
MapCreate and NauticPath are recognized as the most popular software solutions for dealing with AT5 files. To install the most up-to-date edition of MapCreate, visit the official Lowrance website. You can download the build that works across all operating systems.
After successful installation, your operating system should seamlessly handle AT5 files via MapCreate.
Set MapCreate as your default AT5 viewer
Setting a default program by file type in Windows
- Right-click your AT5 file, then navigate to the "Open With" option and click "Choose Another Application" to continue;
- From the list of applications in the pop-up window, find and select MapCreate as your desired application;
- Check the "Always use this app" checkbox, and then click "OK" to set your chosen app as the default for opening AT5 files.
Set default app to open files on Mac
- Right-click or Control + left-click on the desired AT5 file to open a menu of available actions;
- Select "Open in application" and click "Other";
- Go to the lower section of the window, where you will find the "Enable" menu. By default, it is set to "Recommended Programs";
- Select "All Programs" from this menu and proceed to search for MapCreate. Check the box next to "Always open in app" to set it as the default option.
How to edit a AT5 file?
Editing AT5 files requires installing professional software that lets you open and edit gis files. Online editors have more limitations compared to dedicated Lowrance Map Format programs.
List of Top AT5 editors 2026
With the mentioned criteria in mind, we have assembled a selection of AT5 editors.
| AT5 Editor Software | Developer | Platforms | Overall Rating |
|---|---|---|---|
| NauticPath | Lowrance | Windows | 4.7 out of 5 (39 reviews) |
| MapCreate | Lowrance | Windows | 4.4 out of 5 (40 reviews) |
Solving Common AT5 File Challenges
AT5 files may present some challenges, but most can be easily addressed with minor software tweaks. See the troubleshooting tips below for guidance.
Are there any techniques or tools available to repair a damaged AT5 file?
Open the damaged AT5 file with a recovery program, and then select the "Repair" menu item to start the repair process. Wait for the recovery process to finish, as it will automatically repair damaged gis files.
What are the telltale signs of a corrupt AT5 file?
Corrupted AT5 gis files may show the following signs:
- Unexpected expansion of the total size of the AT5 file;
- Opening or processing the file in MapCreate or other programs causes instability or crashes in the program;
- The file shows errors when trying to open it or does not open completely;
- While working with the file, error messages appear;
- Editing the archive in MapCreate is accompanied by slow performance or delays;
What factors contribute to MapCreate crash?
MapCreate crashes can occur due to outdated software versions. To mitigate this, install the latest updates for Lowrance products.
A simple restart of your computer can often fix many common problems, which is why it is the recommended first step before making any adjustments to your software settings.