# General Download and installation instructions
Java OceanAtlas (JOA) is a computer application written in Java. JOA and its support files must be installed on your computer. JOA cannot be opened/run from removable media such as a CD or DVD, nor can it be opened/run over a network. 

Installing JOA is accomplished by downloading a zipped file and following macOS-specific installation instructions on macOS or launching the JOA installer on Windows. See the platform specific installation instructions. A JOA installation is composed of the JOA application and its support files in a single folder/directory. 

Once you have installed JOA, you should have a folder/directory on your computer with these contents:
```{figure} figures/general_install_1.webp
:name: mac_install_contents

macOS installation contents
```

```{figure} figures/general_install_2.webp
:name: windows_install_contents

Windows installation contents
```

## Support Files
### Bathymetry Add-ins
The Java OceanAtlas download contains various bathymetry files, including coarse ETOPO-60 (one degree spatial resolution) and medium ETOPO-20 (twenty minute resolution) files.
If you would like to add higher-resolution files, download any or all of the fine resolution ETOPO-5 files (five minute resolution) and place them (unzipped if your bathymetry file download was zipped) into the JOA_Support folder/subdirectory on your computer.