I have two GPS units - a Garmin Colorado and a eTrex. Both of them allow me to choose between different datums. Which datum should I use for OpenStreetMap?

asked 06 Jul '10, 17:44

Andy%20Allan's gravatar image

Andy Allan
11.9k23121147
accept rate: 29%


You should use the WGS 84 datum.

permanent link

answered 06 Jul '10, 17:50

TomH's gravatar image

TomH ♦♦
3.2k83541
accept rate: 20%

All Garmin GPS devices always record the tracklog and waypoints in WGS84, no matter what you have the datum set to.

All the datum setting changes is the numbers displayed on the screen, and the NMEA output.

So unless you are using the NMEA output, you can set the datum to whatever you like, eg you can set it to your local grid and datum to relate to other maps. If you're using the NMEA output, you should know what you're doing, and have your receiving software set to the correct datum.

Note: while this is true for Garmin, other brands may vary, and might record the tracklog in different datums. So check this before using with Openstreetmap.

permanent link

answered 10 Jul '10, 22:45

Vclaw's gravatar image

Vclaw
9.2k893140
accept rate: 22%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here

By RSS:

Answers

Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text](http://url.com/ "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:

×2

question asked: 06 Jul '10, 17:44

question was seen: 12,245 times

last updated: 10 Jul '10, 22:45

Related questions

powered by OSQA