We use the simple type 7 or type 3 hand compass. Keep it in your wet notes
and carry it in your hand when surveying. Place next to the line and read
from above. It's simple and fast. Forget digital or anything over
complicated.

Chris

----- Original Message -----
From: Danilo Allegrini <speleos@ma*.co*.br*>
To: <techdiver@aquanaut.com>; <cavers@ca*.co*>
Cc: Zidane <dklein@uo*.co*.br*>
Sent: Monday, May 10, 1999 4:27 PM
Subject: compass and depth gauge


> Hi folks...
>
> I recall a discussion on this subject about a couple of years ago... I
went
> through the archives and found some very interesting data, but I still
have
> some questions...
>
> I will give my background first, in order to let you know which is my
> current degree of knowledge... I have been surveying in dry caving for the
> last six years and my Caving Club is responsible for 30~40km/year of BCRA
5B
> surveys... I was personally involved in the developing of the all the
> present technics we use today. My personal choice of compass is for
suunto's
> KB-14, balanced for zone 3, even though I also own a very similar Brunton
> model and a french Axium...
>
> Since I took up cave diving, my main objectives were all toward underwater
> survey... It was very easy to adapt our current procedures to use
underwater
> (wow! you have a _physical_ survey line...), but our biggest barrier to
> achieve the BCRA 5 grade was in the quality of the instruments...
>
> So, does anybody have any experience using a digital compass that is
> accurate to 1 degree?? I also learned that George and the WKPP are being
> succesfull using Suunto forestry models... could you guys please tell me
> which is the model?? If it is something similar to the KB-14, how do you
use
> it without reading through the window?
>
> Also, any tips in a very precise depth gauge would be of great use...
>
> greetings from Brasil,
>
> Danilo Allegrini
>

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