Starting on an advanced_help GMap manual.

help/filter.html

+<!-- $Id$ -->
+<p>If you would like to use GMap macros directly in nodes, you will need to
+activate the <em>GMap filter</em> on one or more
+<a href="base_url:admin/settings/filters">input formats</a>.</p>
+
+<p>To add a new input format, click the
+<a href="base_url:admin/settings/filters/add">Add input format</a> tab
+and fill in the form.
+</p>
+
+<p>To reconfigure an existing format, click the <em>Configure</em> link for the
+input format you wish to change on the
+<a href="base_url:admin/settings/filters">input formats</a> page.
+</p>
+
+<p>
+If you are using the <em>HTML filter</em> or another filter that strips or
+manipulates HTML content, it is highly recommended to keep them <em>above</em>
+the GMap Filter in the filter order. When configuring an input format, click the
+<em>Rearrange</em> tab to see and change the filter order.
+</p>
+
+<p>
+After adding the <em>GMap filter</em>, you can paste GMap "macros" into a node
+and they will turn into maps when viewing the node.
+</p>
+
+<p>
+If you have the <em>GMap Macro Builder</em> module installed, you can easily
+<a href="base_url:map/macro">create a macro</a> suitable for pasting into a
+node.
+</p>
+
+<p>Read <a href="http://drupal.org/node/213156">http://drupal.org/node/213156</a> for more information on input formats.</p>

help/gmap.help.ini

+; $Id$
+
+[setting up]
+title = "Setting up GMap"
+file = setting-up
+
+[filter]
+title = "Configuring and using the GMap Filter"
+parent = setting up
+file = filter

help/setting-up.html

+<!-- $Id$ -->
+Setting up GMap