Cave Survey - Brunton Pocket Transit User Guide

[@pbalister]

Ah this brings back memories of the glory days of cave surveying! Brilliant video and should be required viewing for all new cave surveyors before moving on to suuntos and distos!

[@DrewNorthup]

Well done. I didn't know those were so much more temperamental than my lensatic compass. I learned something.

[@vladislavshevchenko331]

The best video with m2 that i found in youtube. Thanks!

[@jaykennedy2411]

Derek, thanks again for another excellent video! Have both composite and metal. Compass/clino that I first learned on. At VPI we had about 6 club property ones with light mud perpetually on them! Awesome tool.

[@DerekBristol]

Thanks Jay. I learned to survey in about 1991 on Sistecos. Admittedly I've never been on a trip where Bruntons were used, but have always had an interest. I made the video partly to educate myself, but also to round-out the information on my website in an effort to make it more comprehensive.

[@chadkeith7592]

I have one of these, thank you for the information I knew nothing about..

[@jeffengland9913]

I have an old keuffel and esser compass with east and west reversed. It was my father's. Information I have found says it is a military compass. My father was in ww2 fighting the Japanese. But still not sure if this was carried by him. It's a little larger than any other military compass I have owned before. Info I have says it was made between 1925 and 1936.

[@bretgreen5314]

Thank you; this answered multiple questions I had : )

[@karladenisseguerrerorosale9041]

Excellent video, thank you.

[@alaba5085]

1:20 Yesterday I bought a compass but the long air level and circle air level aren't between the lines in the same time 3:03 . Is it a factory error ? I don't know what to do

[@DerekBristol]

The circular level is used when taking azimuth readings, and the cylindrical level is used when taking inclination measurements. They don't both need to be leveled at the same time. It's just a coincidence that they look this way in the video at 3:03.

[@Nguagemaster]

Could you make a video on oversuit care and maintenance please, can't find any online really. Thanks.

[@DerekBristol]

I'm thinking of doing a few reviews on cave over suits. I have the AV one and two-piece suits, a Meander nylon and PVC, and an older Lost Creek. I'll probably talk a little about care and maintenance in the reviews.

[@horseinsport]

i bought one of these a while ago. when i sit it flat on the table it never shows level by the bubble and often the needle is binding. is that common should I send it for service? seems to me flat on the table the needle should have free travel and such...

[@ericrollins4607]

So how would the accuracy of the mirror method on a pocket transit compare to using a hand bearing compass like the Suunto KB-14 when taking azimuths?

[@DerekBristol]

Accuracy and precision is about the same, i.e. within 0.5 degrees. Most people would agree that using a Suunto is easier than a Brunton in most situations.

[@carls.6746]

just got a 2010 new old stock M2 military version... the dial it not accurate. the dial can be off by 10 to 40 mils. for instance when north points to 0 south points to 3180 (-20) and: N at 1000 to S at 4160 (-40) N at 2000 to S between 5160 and 5180 (-30) N at 3000 to S at 6200 (which is correct) N at 4000 to S between 820 and 840 (+30) N at 5000 to S at 1820 (+20) N at 6000 to S between 2780 and 2800 (-10) even the bubble in the bubble level for the inclinometer is a 1/3rd the size it should be. is this normal? just spent an hour on ebay and of the ones in seemingly good enough condition to catch my eye i saw that a lot of them seemed NOT to have their N and S point on the needle read exactly 3200 away from each other. soooo would it still be accurate to use especially in navigation? the one in the video in on point. the manufacturer mark is EMERSON CO. ROLLING MILLS EST.CA 4BUR2 serial no. 2510 05/2010 19200 MIL-C-58052 (BLANK NOTHING) EDIT: just got a metal one made in 1980 and its much better. i made sure to carefully check the pics. although the sight window is glass and not just a wire the dampening and stability of the needle is far better then the 2010 plastic version. just the way the needle moves i could tell the quality increase is considerable. serial no. 215783 4/80 19200-MIL-C-58052 2R524

[@chantelclements5436]

How do you manually damp the motion of the Brunton needle??

[@thanakornsinthatheeyakorn4901]

Should I get brunton m2 or harbin dgl-8

[@lenclwyd7670]

You ever misspell a guitar eq pedal and wind up well-prepared for spelunking?

[@DerekBristol]

No, but I’m guessing you have!

[@0505abab]

Thats crazy im not smart enough to do it id get lost in the cave 20' in

[@TheMarsgia]

Sorry for asking. Im a dummy when ti comes to compass. Just starting out. Will you recommend this for Hiking Trekking?

[@clintonelmore8366]

We used them for nearly everything in field geology. They are pretty much bombproof and can do anything any other compass can do. They just cost a lot.

[@j.davidc6846]

Sun 2

[@albertosanjuan6601]

don´t mams no se ingles :(

[@josscar4973]

Is this for cave only?

[@DerekBristol]

No. Often used by geologists for measuring strike and dip. Not really used for navigation.