<div class="gmail_quote">On Sat, Jan 2, 2010 at 12:54 AM, Shaun McDonald <span dir="ltr"><<a href="mailto:shaun@shaunmcdonald.me.uk">shaun@shaunmcdonald.me.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div style="word-wrap: break-word;">It is very common for GPSs to give errors for whatever reason. Interference is very common from things like buildings. Newer units are less likely to have an issue. You simply need to go along that track again a few times to get an averaged out reading.<br>
</div></blockquote><div><br>Well...ok. But in this case I have the aerial photography, so I can just trace it, once I know more or less where the path goes. I was just curious if there was a way to detect errors at the time - repeating every trace several times "just in case" would be pretty inefficient. <br>
<br>Anyway, I'll try SLXViper's suggestion.<br><br>Steve<br></div></div>