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  1. #1
    Member
    Join Date
    Apr 2010
    Location
    Puerto Aventuras, Mexico
    Posts
    95

    Default Help with Compass

    I just started to use compass and cant see how to enter depth. I can only enter a depth difference between stations. Maybe it works this way but I can't imagine why for UW caves. I will RTFM but for the time being maybe somebody has a quick fix for me. Any help much appreciated!

    Alan Formstone
    Puerto Aventuras, Mexico

  2. #2

    Default

    Hi Alan,
    I was thinking when you are about to enter data (Edit Survey) go to "Edit Heading" and there "Edit Settings" go to "Unit" and for Declination you use "Depth Gauge" - when back at Edit Survey you have new column for depth.

    I don't know if it's THE way to do it and if it answers your question but I'm sure you will tell me!

    Saludos,


  3. #3

    Default

    You can't enter a depth directly with Compass. You have to enter the difference in depth between the stations. Its a pain at first, but you get used to it.

    There is an advantage: Many caves fluctuate in depth due to river/lake levels or tides. If you enter depth directly you have to have a reference and correct your depths to it. With Compass, its all relative to the first station and self correcting.

    ____________________________
    Mike Poucher
    www.cavesurvey.com

  4. #4
    Member
    Join Date
    Apr 2010
    Location
    Puerto Aventuras, Mexico
    Posts
    95

    Default

    Thanks very much Mike,

    I was wondering if that was the case. So if depth is relative I need to be careful to enter -/+ values for the difference. I guess I can import a spreadsheet or something that could massage my raw data first. Maybe I should just pop over to FL and do your course and save a lot of headaches.


    Jason, thanks for the input. I guess we are on about the same page . Hope I bump into you one day out there.

    Alan Formstone
    Puerto Aventuras, Mexico

  5. #5

    Default

    Quote Originally Posted by alanf View Post
    I guess I can import a spreadsheet or something that could massage my raw data first.
    That's not a bad idea, as it helps preserve your data in its original form. Earlier versions of Compass did not accept difference in depth and you had to calculate the inclination for every shot, which was quite easy once you had a spreadsheet set up. I used to do it all on an old Hewlett-Packard HP200LX palmtop running the DOS version of Compass, using the built-in Lotus 123 for the number crunching.

    Andy


  6. #6
    Member
    Join Date
    Aug 2008
    Location
    Quebec and Playa del Carmen
    Age
    37
    Posts
    267

    Default

    I chip in a plane ticket for Mike in exchange of a workshop on survey and map drawing...

    Etienne Rousseau

    Revo rebreather Instructor
    Cave Instructor
    --------------------------
    http://www.plongeecapitale.com/

  7. #7

    Default

    Quote Originally Posted by alanf View Post
    Thanks very much Mike,

    I was wondering if that was the case. So if depth is relative I need to be careful to enter -/+ values for the difference. I guess I can import a spreadsheet or something that could massage my raw data first. Maybe I should just pop over to FL and do your course and save a lot of headaches.


    Jason, thanks for the input. I guess we are on about the same page . Hope I bump into you one day out there.
    oh well, and I thought I had you covered with my explanation!!
    So far I haven't bothered with depth as I use it for "stick map" more than anything but in the future I will certainly do it!
    I heard Matt at Protec has a good course so is Fred at ZG!
    Maybe will be on the class together
    See you around


  8. #8
    Administrator Forum Admin
    Join Date
    Oct 2000
    Location
    Georgia
    Posts
    23,031

    Default

    You guys might have better luck getting Jason Richards down there

    Forrest Wilson (with 2 Rs)
    Any opinions are personal.
    Sump Divers

  9. #9

    Default

    Quote Originally Posted by CaveBuddy95 View Post
    oh well, and I thought I had you covered with my explanation!!
    So far I haven't bothered with depth as I use it for "stick map" more than anything but in the future I will certainly do it
    Even a 5 foot change in depth is going to have an effect on your distances. Not accounting for it, even in a stick map is going to produce innaccuracies. Several changes and you could easily be off by 100 feet . I started using the older version of Compass and was happy to see they added the depth change. I wish I had the patience to figure out Walls. I hear it's a better program once you know how to use it.

    Rob Neto
    Chipola Divers, LLC
    Check out my new book - Sidemount Diving - An Almost Comprehensive Guide
    "Survival depends on being able to suppress anxiety and replace it with calm, clear, quick and correct reasoning..." -Sheck Exley

  10. #10

    Default

    Hi Rob,
    yes you are absolutely right and it can become critical for gas planning!
    It is mainly to get the idea of the cave, for the best view I have to buy the official QRSS map!!



 

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