Subject: Altimeters
From: Laurie & Leanne Knight <>
Date: Mon, 15 Oct 2001 18:00:00 +1000
michael hunter wrote:
>      Re Laurie's suggestion re altimeters as a Navaid: my experience is that
> changes in atmospheric pressure can make altimeter readings unreliable to
> say the least, unless the weather is stable, the journey relatively brief,
> and you have a good reference point or some kind of access to standard
> atmospheric pressure readings. - ??
>       Also, what are rogaines?

The impact of weather changes on altimeter readings is relatively slight
- 10-20 metres, which is nothing when you are climbing a 1000metres. 
Furthermore you can often callibrate it at known points.  Altimeters are
very useful when descending creeks and you know you want to climb out at
a certain point ...

Rogaines are to orienteering what marathons are to middle distance
events.  They are day-night events that involve accumulating points
rather than a jog around a set course.  A championship rogaine is a 24
hour event, although there are often 6,8,12,15 hour alternatives.  They
start and finish from a hash house, where you can call in from time to
time to refuel and rest if you aren't going flat chat.  The gurus don't
stop and sometimes get to all the control points inside the time limit.

Rogaines are generally run when there is a full moon and are typically
based on 1:10,000 scale maps.  Occasionally 1:5000 scale orienteering
maps are available, but that's luxury ...

On the safety front, rogaine maps often indicate a safety bearing, which
you can follow if you get lost, which will bring you out to a road or

Regards, Laurie.
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