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[svn r3789] Converted all gifs to pngs.

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@@ -80,7 +80,7 @@ arrival I left the unit in the sunshine for 4 hours plotting the position of
basecamp. Slowly a track was built up wandering around in a big blob around
the campsite.
<Center><IMG SRC="img171.gif">
<Center><IMG SRC="img171.png">
<P>Five-hour GPS plot showing how the readings wander, and that the geometric
mean is likely to be a better position estimate than any of the individual
@@ -133,7 +133,7 @@ minutes it usually improved to be within the correct area. You can tell this
once you have a few waypoints marked because you get a line on the map screen
zooming in from way over to one side.
<Center><IMG SRC="img173.gif"><br>Figure 1
<Center><IMG SRC="img173.png"><br>Figure 1
showing how the first couple of readings after getting a fix can be
several hundred metres off.</Center>
@@ -380,7 +380,7 @@ give better results, but it depends how good the surface survey is.
<P>So, after a great deal of head-scratching I have a pair of columns on my
spreadsheet giving co-ordinates in G&amp;K (Austrian Cavers) co-ordinates. It
looks like this, showing the actual data and (boxed) the averaged
results:<IMG SRC="img174.gif">The co-ordinate pairs are: decimalised
results:<IMG SRC="img174.png">The co-ordinate pairs are: decimalised
Lat./Long., interpolated G&amp;K, offset 'Austrian' G&amp;K, GPS calculated
G&amp;K (note X&amp;Y reversed on these, cos that's the way the GPS displays
them).
@@ -396,7 +396,7 @@ better than the waypoint results.
<P>Here is typical example of the results:
<P><IMG SRC="img175.gif"><br>Figure 2
<P><IMG SRC="img175.png"><br>Figure 2
showing 5 fixes for entrance 161d, and the 5 corresponding averaged
positions.
@@ -409,7 +409,7 @@ behaviour that means a GPS reading alone can be thoroughly misleading. The
bar on the left shows the 100m limit, and the readings are nearly all with in
this, although not quite.
<P><IMG SRC="img176.gif"><br>Figure 3, showing the area
<P><IMG SRC="img176.png"><br>Figure 3, showing the area
of the plateau near top camp with surface surveys and GPS positions.
<P>I have selected a number of locations, the corresponding GPS waypoint, and
@@ -452,25 +452,25 @@ life significantly easier for this sort of work.
<HR>
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