.AT5 File

.at5 is Lowrance Map File

Key Features: .AT5 File Extension

Features	Description
File Extension	.at5
Format	Binary
Created by	Lowrance
Category	GIS

What is an .AT5 file?

Map file used by Lowrance navigation devices, which are used for marine, outdoor, automotive, and aviation activities; contains a map that can be loaded into the device through Lowrance software; used for storing pre-fabricated and custom maps.

Lowrance

GIS

Binary

How to solve problems with AT5 files

Associate the AT5 file extension with the correct application. On :
Windows: Right click on any AT5 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.AT5 files". Mac: Right click (or Ctrl-click) the AT5 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
Update your software that should actually open .AT5 is Lowrance Map File. Because only the current version supports the latest AT5 file format. Search, therefore, e.g. on the Lowrance manufacturer website after an available .AT5 is Lowrance Map File update.
To make sure that your AT5 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.