<p>You do not need to install any special software to use a Chromebook (even a very old one) to
<ul>
<li>interact with the website,
<li>upload photos, GPS tracks,
<li>upload scanned drawings or scanned raw survey notes.
<li>You can create and online-edit survey wallet data.
<li>You can create new records for <ahref="../survey/cavedescription.html">entirely new caves</a>,
<li>manage QMs in new discoveries and
<li>type in <ahref="../survey/cavedescription.html">cave descriptions</a> directly into the website.
</ul>
<h3>Survey Laptop Use - not really</h3>
<p>But Chromebooks do not have any easy, simple way of running Tunnel, Survex or Therion. So you can't create a centre-line plot or trave over a centre-line plot to create a cave survey.
<p>To a very limited extent you can get around this by running Survex/Cavern <ahref="/survexfile/caves-1623/264/watertorture.svx">on the expo server</a>, where you can type in and edit survex files. This will serve to check for syntax errors. But it won't give you a .3d file you can visually spin around in 3D and you can't print out a centre-line plot.
<p>If you really want to run tunnel or therion you need to enable Linux (see below).
<h3>Bulk-update Laptop Use</h3>
<p>This is when you need to handle large numbers of files. This is where you need to get the
<ahref="keyexchange.html">key-exchange thing</a> sorted out so you can use ssh.
<p>OK, so you can't do any of the cave survey jobs with tunnel or therion, but there are some cave data management jobs you can do, such as rename a whole load of files when a cave gets a kataster number, e.g. when Balkonhöhle got renamed from 2002-05 to 1623-264.
<p>With ssh, you can even log in to the server and reset all the data imports to troggle (nerds only).
<h4>Enabling ssh and scp - access Linux apps</h4>
<p>You may not need to install any software to get <var>scp</var> or <var>ssh</var> running either: these are pre-installed on every Chromebook as part of ChromeOs, but getting to them is not so easy.
<p>Read <ahref="https://support.google.com/chromebook/answer/9145439?hl=en">Linux on your Chromebook</a>.
<p>Either enable <ahref="https://chromeos.dev/en/linux">Crostini</a> or, on a pre-2019 Chromebook, do this:
<ul>
<li>Boot into <ahref="https://www.businessinsider.com/guides/tech/chrome-os-developer-mode?r=US&IR=T">Developer Mode</a> (which deletes all user data, so do this when you buy the thing, not later).
<li>Visit the special <ahref="https://chromium.googlesource.com/chromiumos/docs/+/HEAD/developer_mode.md">[crosh] </a> web page in the Chrome browser by pressing Ctrl-Alt-T
<li>type <var>shell</var> which then puts you into a bash session
<li> Now you can access ssh, ssh-keygen, sftp and scp (but not rsync) from the command line.
<li>NB The default user is 'chronos' and they keys will be generated in <var>/home/chronos/user/.ssh/</var> so generate them using the command <var>ssh-keygen -C myrealname@mychromebook</var> and get the public key copied ot the expo server as it instructs in <ahref="https://expo.survex.com/handbook/computing/keyexchange.html">Key Pair setup</a>.
</ul>
<p>Alternatively you can run the Chrome extension <ahref="https://mosh.org/">'mosh'</a>, which achieves the same thing as ssh, but this will stop working at the end of 2022 unless someone re-writes it. but youu can run the Linux version if you enable Linux.
<p>Or you could get rid of the Chromebook software entirely install a full Ubuntu system
