Errata and Updates

Mistaks and erors do creep in, and they're listed here if they are at all likely to confuse the reader. Some aren't errors but are clarifications, or extra information. All are corrections contributed by readers, or questions submitted; thank you all!

Edition II Errata and Clarifications

Section 2: How GPS Works

Page 12 The clock would need to slow down by only 13.33 microseconds to make all circles meet, not a full second.

Section 5: GPS Equipment

Page 102 Should be 17", not 17' -- for a 17 inch monitor!

Page 104 A point was made about laser printers vs inkjets. A laser print could be used instead of an inkjet. Laser print is less prone to running when wet. However, you're better off protecting the print in a map case or laminating it. Lasers are usually black and white, which is a disadvantage when using a map designed for colour. Colour lasers are available but are more expensive than a colour inkjet.

Edition I Errata and Clarifications

Chapter 3: Maps, Grids and Datums

Page 36 A nautical mile is 6076 feet. A statue mile is 5280 feet. The table has the two transposed, and a statute mile is 0.62 kilometers, not 0.02.

Page 47 Lat/Long Summary

Although parallels of latitude are "horizontal" and run east-west, they actually tells you how far north or south you are. Lines of longitude are "vertical", run north-south, but tell you how far east-west you are.
There are only 180 degrees of latitude, 90 above the equator and 90 below, both numbered from 1 to 90. 0 is the Equator. 90 degrees North is the North Pole, 90 degrees south is the South Pole. The summary bullet point mistakenly lists 360, which would make for an odd shaped world.

Page 49 "...you can see gridzone 55H covers western Victoria. 54H covers Eastern Victoria..." should read:
"...you can see gridzone 54H covers western Victoria. 55H covers eastern Victoria...".

Chapter 11: Out in the Field

Page 150/151 Diagram 11.6, page 150 refers to the second reading as 258 degrees in a southerly direction; that should be west-south-west. Diagram 11.7 on page 151 refers to a west-south-west direction; that should be southerly.
Point 3 and 5; the second reading should be 258 and the third 198. It doesn't make any difference to the overall technique though.
Clarification; the first reading is to the junction, the second and third are from the junction.

Chapter 12: Other Fun Things to do with a GPS Receiver

Page 155 Australian Geocaching forum changed to:
http://geocaching.com.au/forum/

Chapter 14: Appendicies

Page 170 Updated URL for the Palm GPS mapping software Atlas:
http://www.gpspilot.com instead of
http://www.gpspilot.com/Atlast.htm (which was a typo anyway!)

Page 173 Maptrax's contact details were omitted from the list of contacts, despite being mentioned on Page 172. Their address is:
P.O. Box 18 Freshwater QLD AUSTRALIA 4870 Phone: +61 7 4055 2229 Fax: +61 7 4055 2229
http://www.maptrax.com.au