Bier book documented

handbook/essentials.html

@@ -56,7 +56,7 @@ downloaded into that folder.
 
 <h3>Old Garmin handheld GPS devices</h3>
 <p>
-These can only import cave entrance locations (waypoints) and paths (tracks) using the Garmin communication protocol. 
+These need the Garmin communication protocol to import cave entrance locations (waypoints) and paths (tracks). You can't do it by simply copyingfiles.
 This means that you need special software on your laptop in addition to a USB cable that connects your laptop to the Garmin device.
 <p>
 <figure><a href="https://www.cablestogo.com/learning/connector-guides/usb">
@@ -66,7 +66,7 @@ This means that you need special software on your laptop in addition to a USB ca
     <figcaption><em>mini-USB b socket</em></figcaption>
 </figure>
 If your Garmin has a <b>mini</b>-USB socket, rather than the usual micro-USB found in phones, then you might have an "old" Garmin handheld, but some modern handhelds still use this old socket.
-<p>Once you have the right cable and connectedyour handheld to your laptop:
+<p>Once you have the right cable and connected your handheld to your laptop:
 <ul>
 <li>On a Windows machine, use "GPSbabel for Windows" which has an easy to use graphical user interface: 
 <a href="https://www.gpsbabel.org/download.html">download GPS Babel</a>
@@ -74,7 +74,7 @@ If your Garmin has a <b>mini</b>-USB socket, rather than the usual micro-USB fou
 but there is no simple, easy to use graphical interface. 
 Instead you must use other software such as QGIS or Viking (download using your usual Linux software installer) 
 which uses gpsbabel to talk to your device. 
-If this doesn't work then there are no useful error messages.
+If this doesn't work then there are no useful error messages from Viking.
 </ul>
 
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