All about AT5 Files

The AT5 file type is primarily associated with C-MAP MAX Charts.

AT5	File extension: AT5
	File type:	electronic chart file

What is an AT5 file?

AT5 files mostly belong to C-MAP MAX Charts. AT5 files mainly contain an electronic chart format used for navigation. They hold detailed digital map data such as depth contours and coastlines and are meant for use with specialized navigation software like that from C-MAP MAX Charts.
In a less common case, these files may store genealogy information and are used by Ancestris Family Tree software. This variant organizes family tree data using SQL-based structures.
Consider these key points provided by FilExt.com:

Primary use: Electronic charts for accurate navigation.

Alternate use: Genealogical tree data storage.

Software: Open chart files with C-MAP tools and family tree files with Ancestris.

FilExt.com tip: Each version is tailored to its purpose, ensuring that the navigation files display layered map data while the genealogy files maintain structured family records.

How to open AT5 files

You need a suitable software like C-MAP MAX Charts to open an AT5 file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your AT5 file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a AT5 file directly in the browser:. Just drag the file onto this browser window and drop it.

Online AT5 Text Viewer

Choose your .at5 file to analyze

or drag and drop it here

Online File Viewer

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AT5 file format:

To view or edit AT5 files you need to know the file format, because it determines how the data in this file is stored. A file format is determined by the file extension and signature, so JPEG images have the extension .jpg and the first bytes in the file are ÿØÿ. However, different programs can use the same file extension, and file extensions can be assigned incorrectly. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our analysis of the AT5 files produces the following result:

You will often come across the AT5 file type. This is primarily used by a single program. The following file formats are most commonly found in AT5 files:

• 95% of all AT5 files start with the bytes 55 AA 05 00, which are crucial for this file format. They consist of illegible, cryptic characters. The average file size is 8 MB with most files being between 31 KB and 360 MB in size. The file type was created 10 years ago, but is still used today. The following keywords are characteristic: Large. An example of a file name is Large.at5 or NOS_Large.at5. Such AT5 files store data about dtexture, small, medium, coastal, waters, europe, lipro and international.
• 4% of all AT5 files use the popular SQL file format. An SQL file contains a lightweight SQLite database, widely used in application development for storing application related data. They consist of unreadable binary data. The file size is in the range of 160 KB to 18 MB. Certain words are almost always found in the files, such as SQLite format 3.

All other AT5 files (1%) have different formats. Tagged as transas, currents, asia, north, tides or south. If you want to find out what your AT5 file contains, drag and drop it onto this page.