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From: Rick Sylvia <Rick.Sylvia_at_ferginc.com>
subject: [Paddlewise] Compasses
Date: Mon, 12 Feb 2001 10:37:54 -0500
Last Fall, I made a few posts regarding book resources for learning
navigation.  Got some good responses - THANKS!

My wife asked me not to follow up on it until March, and she'd work it into
my birthday list (my Christmas list was already full :-)  ).  So, I've given
her the names of the books, and know she's asking about what features to
look for in a "middle of the road" compass.  I've seen some over $100 and
some "toys" for as little as $5-6.

What should I be looking for in terms of brands, features, etc.?  I'm
looking for a hand held version that can be used for both Kayaking and
Hiking, as opposed to a deck mounted compass for the Kayak.  I haven't
needed one for hiking in the past because I've mainly been in areas with
decently travelled and marked trails, but the more I get into it, the more I
want to venture out into some "wilderness".  I'm sure you can relate.......


So, what's your opinion?  What are the "must have", "nice to have" and
"useless" features?

Rick


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From: Dan McCarty <dmccarty_at_us.ibm.com>
subject: Re: [Paddlewise] Compasses
Date: Mon, 12 Feb 2001 12:55:41 -0500
Rick,

I have a Silva brand compass, I think it is the Ranger model.   Look for
the ability to change the declination, a mirror, clear plastic base,
measuments that are on the same scale as topo maps, and a moveable
heading/bearing wheel.

Ok, so that last one is not very discriptive!  8-)  Make sure that the
"wheel" that holds the bearing, N, S, E W , etc can rotate in the compass.
This allows you to set a bearing on the compass.  A mirror helps locate a
bearing in the distance by looking out while being able to look down at the
compass via the mirror.  A clear base helps so you can set the compass on a
topo map to setup figure out bearings and distance.

I took a simple compass course years ago at a state park taught by one of
the rangers.  We did some very simple games using bearings and distance.
Very simple in concept but it could be hard in practice.  I started using
the compass and a very detailed map of a local park to walk off trail.  I
would setup up points to hit, figure out a bearing and see how close I
came.  I was impressed out how accurate this could be.  One of the valuable
lessons in the class was figuring out how much distance you cover in a
pace.  A pace is two steps.  We walked back and forth over a known distance
to figure out this measurement.  Once you know your pace, a map and compass
or very powerful tools.  I use the pace all the time on the property I
bought.  Its unreal how often I need to know a distance when I don't have a
ruler or tape.  But I can pace it off pretty accurately.

Another thing that comes in handy for hiking are "ranger beads."  These are
just beads on a string that you can move to keep tract of the number of
paces you have walked.

The class used very simple games that I pretty sure came in the Silva
compass manuals.  I would think any decent land navigation book would have
such games.  Hmmm, there is a website, http://www.adtdl.army.mil/atdls.htm,
with the US Army manuals.  I have not looked to see if they have any land
navigation manuals but I they seem to have everything else.  You might want
to search the site and see what you can find.

The games were simple tasks.  The ranger laid out a line on a bearing  that
had distance marked out evenly and number from 1 to n.  He had courses
discriptions setup on cards.  Start at point 3, walk 33 feet on a bearing
of 193 degrees.  You would get to this point and follow the next bearing
and distance.  At the end of the card you should be back at point 3 or some
other point.  If you were supposed to be at 3 and ended up at 4.  You made
a mistake.  Simple tasks but you had to be able to pace the distance and
follow a bearing.  Kinda fun to! 8-)

I have a compass for the kayak but I forgot the brand name.  It can be
deckmounted or handheld to take bearings.  I really have no need for the
kayak compass but it fun to practice holding bearings.  Some day I might
need the skill....

Hope this helps....
Dan McCarty


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From: Steve Scherrer <Flatpick_at_teleport.com>
subject: Re: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 04:20:59 -0800
I would skip the part about looking for a compass with adjustable
declination/ variation.  We teach boaters to NEVER use this feature as it
will be a different bearing than the Marine compass on your deck, with no
adjustment options.  Don't get confused, don't adjust variation on the
compass.

just 2 centavos.

Steve Scherrer
www.aldercreek.com



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From: Peter Treby <ptreby_at_ozemail.com.au>
subject: RE: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 09:26:10 +1100
As with other sea kayaking equipment considerations, you quickly find that
when you are on the water you need your hands on the paddle. A deck mounted
compass is really the best answer, with an orienteering type flat compass
for course plotting on land, and as a spare.
I have a Silva deck compass, model "58F Kayak" similar to the Suunto Orca,
mounted with bungy cords. This has been very good, easy to read. See it at
http://www.silva.se/marine/index.htm
It's good to have the compass removable when not needed. This saves damage
and theft.

Regards,
Peter Treby
37ş 42' S  145ş 08' E



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From: Gabriel L Romeu <romeug_at_erols.com>
subject: Re: [Paddlewise] Compasses
Date: Mon, 12 Feb 2001 20:01:24 -0500
> What should I be looking for in terms of brands, features, etc.?  I'm
> looking for a hand held version that can be used for both Kayaking and
> Hiking, as opposed to a deck mounted compass for the Kayak.  I haven't
> needed one for hiking in the past because I've mainly been in areas with
> decently travelled and marked trails, but the more I get into it, the more I
> want to venture out into some "wilderness".  I'm sure you can relate.......


Peter Treby wrote:
> 
> As with other sea kayaking equipment considerations, you quickly find that
> when you are on the water you need your hands on the paddle. A deck mounted
> compass is really the best answer, with an orienteering type flat compass
> for course plotting on land, and as a spare.
> I have a Silva deck compass, model "58F Kayak" similar to the Suunto Orca,
> mounted with bungy cords. This has been very good, easy to read. See it at
> http://www.silva.se/marine/index.htm
> It's good to have the compass removable when not needed. This saves damage
> and theft.
> 
I will have to take the agree/disagree with both of the postings, both
of the compasses are useful and have different purposes.  The hand held
facilitates taking bearings from the kayak, generally from 2 points
anywhere from a 360 degree axis of the paddler.  This may be done with a
deck compass, but is very cumbersome having to rotate and point your
bow.  The deck compass is useful for following a bearing once it is
ascertained by examining the calculated readings of the handheld and
referencing them from your chart.  You can probably use the handheld for
this, but the degree of error would be much greater.

RAy Killan put out and excellent series last year in Anorak on kayak
navigation, and is compiling it for a small book- also does workshops. 
May want to contact him at  
http://members.aol.com/kayakillen/katabasis/   .I enjoyed Burch, which
is quite in depth and interesting, but the articles that Ray wrote are
far easier for most to understand it seems.  I thought it extremely
clear and well written.

I find that a compass with a rotating bezel, reasonably large clear
plexi rectangular (important) base (c thru compass), liquid dampened
works just peachy for me.  Cost around 15-20 bucks US.  Luxury is one of
those military bearing compasses with the wire for bearing only, but you
still need the other for transferring data to the chart.

BTW, I expect no financial compensation for the influence of selling any
of Ray's books, but I admit most of the stuff I learned about navigation
is from him.

and also, if it is possible, a landmark is a better target to aim at
after you adjust the bearing from the deck compass- better to avoid
seasickness and the math needed to compensate for shifts on the
compass.  this may be a problem open water or poor visibility.

regards, gabriel

-- 
                            Gabriel L
Romeu                                                    
http://studiofurniture.com        İİİİİ   furniture from the
workshop               
http://studiofurniture.com/diary  İİİİİ   life as a tourist, daily
journal         
http://studiofurniture.com/paint  İİİİİ   paintings, photographs,
etchings, objects
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From: Whyte, David <david.whyte_at_amsa.gov.au>
subject: RE: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 09:39:23 +1100
I agree with Peter about deck mounting and removable but another
important point is try and have your deck mounted compass as far forward
as your eyesight will allow. This makes it much easier to be glancing at
your compass while still paddling towards a bearing. Its also easier to
take a bearing with it well forwards. Mine (Sailor II) has very large
numbers (drops off the last digit IE 270 is just 27) and is a long way
forward.

David
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From: Sid Taylor <tayls_at_snowcrest.net>
subject: Re: [Paddlewise] Compasses
Date: Mon, 12 Feb 2001 17:27:47 -0800
A Nexus (Silva) 70UN is a hand bearing compass that fits in a socket mount.
The card is suspended in a globe. The UNE has a light.  It is readable,
precision made and can be corrected for deviation. While ashore it can be
used to take accurate line of sight readings. I've used one for years.
They're available from West Marine and cost about $80-$100.
Sid


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From: Chuck Holst <cholst_at_bitstream.net>
subject: RE: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 07:58:23 -0600
I agree. A deck compass is a must for sea kayaking. A flat, orienteering 
compass, though, is useful for plotting a course on water as well as on 
land. I use an inexpensive Silva III, which slips easily into a PFD pocket. 
Use the orienteering compass to determine your course, and the deck compass 
to follow it. Note also that some people say that looking down at an 
orienteering compass in rough water can lead to seasickness -- another 
reason to have a deck compass.

Chuck Holst


-----Original Message-----
From:	Peter Treby [SMTP:ptreby_at_ozemail.com.au]
Sent:	Monday, February 12, 2001 4:26 PM
To:	'Rick Sylvia'; Paddlewise (E-mail)
Subject:	RE: [Paddlewise] Compasses

As with other sea kayaking equipment considerations, you quickly find that
when you are on the water you need your hands on the paddle. A deck mounted
compass is really the best answer, with an orienteering type flat compass
for course plotting on land, and as a spare.
I have a Silva deck compass, model "58F Kayak" similar to the Suunto Orca,
mounted with bungy cords. This has been very good, easy to read. See it at
http://www.silva.se/marine/index.htm
It's good to have the compass removable when not needed. This saves damage
and theft.

Regards,
Peter Treby
37o 42' S  145o 08' E

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From: Sid Taylor <tayls_at_snowcrest.net>
subject: Re: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 11:21:40 -0800
Don't confuse declination and variation (difference with magnetic north on
land and sea, respectively) with deviation which is error attributable to
local interference from ferrous or nickel or electromagnetic objects in the
proximity of the mounted compass such as a radio or speargun etc. I always
navigate using magnetic north as indicated on the compass-rose on a chart.
Sid Taylor
-----Original Message-----
From: Steve Scherrer <Flatpick_at_teleport.com>
To: paddlewise_at_paddlewise.net <paddlewise_at_paddlewise.net>; Dan McCarty
<dmccarty_at_us.ibm.com>
Date: Tuesday, February 13, 2001 8:35 AM
Subject: Re: [Paddlewise] Compasses


>I would skip the part about looking for a compass with adjustable
>declination/ variation.  We teach boaters to NEVER use this feature as it
>will be a different bearing than the Marine compass on your deck, with no
>adjustment options.  Don't get confused, don't adjust variation on the
>compass.
>
>just 2 centavos.
>
>Steve Scherrer
>www.aldercreek.com
>

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From: Peter A. Chopelas <pac_at_premier1.net>
subject: Re: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 16:02:47 -0800
>>
Steve Scherrer wrote:

> I would skip the part about looking for a compass with adjustable
> declination/ variation.  We teach boaters to NEVER use this feature as it
> will be a different bearing than the Marine compass on your deck, with no
> adjustment options.  Don't get confused, don't adjust variation on the
> compass.


I would absolutely agree with this statement with one exception.  I have 
spent many years in the backcountry with USGS maps and also do a fair 
amount of land surveying in my business and career, I also own a number of 
different compasses and other devices for overland navigation.  It is 
almost impossible to prevent inadvertent errors when using magnetic 
compasses without an declination adjustment on the compass when doing 
overland navigation.  So if you intend to use your hand held compass for 
backpacking or route find inland then you must have a declination 
adjustment.  I would almost say it is mandatory if you do any serious 
backcountry overland travel.

When I learned about nautical navigation I was surprised to learn that 
there is no need to ever concern yourself with declination because the 
charts are all set up be able to use magnetic north exclusively (perhaps 
the USGS who makes the land maps could learn something from the nautical 
charts).  If you never intend to use the hand held compass for land 
navigation then absolutely you do not need or want to worry about 
declination, it would only serve to confuse you.  Especially in far North 
locations where the declination is very large.

In my business every time I have to explain magnetic North to trainees I 
always get a lot of confused looks.  It is actually not that easy for most 
people to visualize whether you add or subtract the declination when going 
back and forth from the map to the compass.

FYI you do not use a magnetic compass for land surveying but often on 
remote properties we have to dead reckon to locate monuments or reface 
markers, or even find the property we are supposed to survey.  Without the 
ability to locate a surveyed reference point the rest of your work is of 
questionable value.  Unfortunately the inexpensive GPS units do not have 
nearly the accuracy you need to find a small metal marker in heavily 
overgrown forests, so very accurate navigation become essential to locate 
them.

Peter

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From: Bob Volin <bobvolin_at_bestweb.net>
subject: Re: [Paddlewise] Compasses
Date: Tue, 13 Feb 2001 21:16:31 -0500
Peter Chopelas wrote,

<snippity>
> When I learned about nautical navigation I was surprised to learn that
> there is no need to ever concern yourself with declination because the
> charts are all set up be able to use magnetic north exclusively (perhaps
> the USGS who makes the land maps could learn something from the nautical
> charts).  If you never intend to use the hand held compass for land
> navigation then absolutely you do not need or want to worry about
> declination, it would only serve to confuse you.

Would you explain your reasoning further, Peter?  I know that the compass
rose on a nautical chart shows both true and magnetic, but the hash lines
(?) on these charts are aligned to true north/south, east/west.  So it seems
to me that one has to pay close attention to variation on a nautical chart.
Of course, if you have a Nav-Aid, everything is much easier (I have no
connection with the good Dr. Sutherland).

Bob V

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From: <gwelker_at_erols.com>
subject: Re: [Paddlewise] Compasses
Date: Wed, 14 Feb 2001 22:12:05 -0500
>Peter Chopelas wrote,
>
><snippity>
>> When I learned about nautical navigation I was surprised to learn that
>> there is no need to ever concern yourself with declination because the
>> charts are all set up be able to use magnetic north exclusively 


I think that depends upon the age of your charts and the amount of change in
declination that occurs each year in the area you are paddling.


Greg Welker

Current Designs Pisces, with sail rig
CLC Cape Charles modified
West Wight Potter 19, #448  "Wight Magic"

"Good seamanship is using superior judgment to prevent the need to use
superior skills."

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