Go Back   Horizons Unlimited - The HUBB > Equipment, Travel > Navigation - Maps, Compass, GPS

Navigation - Maps, Compass, GPS How to find your way - traditional map, compass and road signs, or GPS and more
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Calendar Contest Voting is now CLOSED. Results to be posted shortly.


World-wide topographic maps for your Android Smartphone

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 5 Aug 2007
smitty's Avatar
Registered Users
HUBB regular
 
Join Date: Nov 2005
Location: Bayou Vista, Texas, u.s.a.
Posts: 90
Bowditch

I have noticed numerous errors in concept regarding usage of GPS, compasses, maps(charts), and applications of these regarding finding ones way out of "nowhere" ie "which is the best compass or GPS etc.". A "cheap" unit in many cases may assist you as well as an expensive one if it is properly used. In many cases it's not the "unit" that is at fault, but the transfer of the data to paper or the interpetation of the data. GPS is based on the concept that the earth is a "spheriod" and it's actually an "oblique spheriod". Transfer of data can conflict when you transpose from "electronic to paper". "How come I'm right at such and such location and the GPS says I'm a mile south?". "Something must be wrong". There is a publication "The American Practical Navigator" by Nathaniel Bowditch which was simply written, very understandable, and is found aboard Merchant and Naval ships worldwide. It explains compasses, GPS, and celestial science and their practical uses. It can be had on line, at any nautical bookstore, or at any "library". If you intend to make the big trip, it's got great information that, in essence, will build you confidence in "Gettin yourself around". Good luck, good reading, and good riding! Captain Smitty
Reply With Quote
  #2  
Old 6 Aug 2007
Contributing Member
Veteran HUBBer
 
Join Date: Jul 2002
Location: Sydney, NSW, Australia
Posts: 1,366
A mile is rather large to atribute to different dataums and/or projections ..

I've experienced map errors .. of several miles. Unless I know the map maker by other maps then I'd rather not trust a single map, if two maps agree then they are probably right.
__________________
---
Regards Frank Warner
motorcycles BMW R80 G/S 1981, BMW K11LT 1993, BMW K75 G/S
Reply With Quote
  #3  
Old 6 Aug 2007
smitty's Avatar
Registered Users
HUBB regular
 
Join Date: Nov 2005
Location: Bayou Vista, Texas, u.s.a.
Posts: 90
Mapped Out!!!

The scale of the map, the type of projection it is based on, and the date of the survey used to make the map(some "new" maps are compiled with old data on parts of the map) can effect the accuracy of where you are. If you are using a small scale (large area map) and have a large scale map (which covers a particular area of the small scale map) and let's say you are on a particular road or area which crosses back on to the smaller scale map, the plotted positions will be usually be different. Let's say on the large scale map you seem not to be on the road, but slightly south of it by GPS plot. When you cross over to the small scale map on the same road, you may be 2 miles north of it by plot. This is due to conforming a flat projection (map) from a sphrical one (the earth). Usually, the map is most accurate at it's mid lattitude (the center of the map east to west) and loses accuracy as you go north or south. The amount of error you could say is not as relevent as knowing this occurs when reading maps. If all else fails, do what I do, stop for a and ask "Hey, where the hell am I?" Don't get lost...... Smitty
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


 
 



HU DVD Spring Special!

Buy the Achievable Dream Collectors Set and get Road Heroes Part 1 FREE!

Achievable Dream - The Whole Enchilada!

Cooped up indoors in crap weather? Binge watch over 20 hours of inspiring, informative and entertaining stories and tips from 150 travellers! Check it out at the HU Store! Remember to order them both and use Coupon Code 'BoxSet+' on your order when you checkout.


What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders


contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!




New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.



Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!






All times are GMT +1. The time now is 08:14.