PDOP's

http://www.gpscity.ca/ has 'Black Friday' deals on the Oregon450 for $229.95 and Dakota20 for $179.95. Also some other coupons for deals at http://www.gpscity.ca/coupons.html

That is curious as the Garmin site (link) shows Unit Software GPSMAP 76CSx Ver. 4.00 as of May 26, 2009

I found it in their FAQ http://gsak.net/board/FAQ.php

You might want to look at this thread (link) on the GSAK forums.

There's a diagram on the pfranc website (link) Scroll down to the "The Dr. T.V. diagram"

See How To Load Maps On My Garmin GPS Unit (link). The MapSource program should be on the same DVD as your maps.

Definitely.

Scaled means measured off a paper map. A lot of these are for the Canadian Gravity Standardization Net (CGSN) Differential is an accurate type of GPS surveying. See How to do a GPS survey to centimetre accuracy.

Have you looked at Downloading GPX/LOC Files (link)? As a premium member you can use Pocket Queries to have files of up to 500 caches each emailed to you or download files of upto 1000 caches from the 'Pocket Queries' webpage. See Creating Your First Pocket Query (link) and Pocket Queries: A Detailed Explanation(link) by Markwell.

This solved it for me. Thanks

I'm not totally up on the finer details of the technology but will try to answer your questions. Yes. Survey systems will have millimetre accuracy while GIS/Mapping systems have sub metre accuracy. The survey systems use more complicated electronics and are much more expensive. All differential systems (including recreational grade with WAAS) use multiple receivers in some respect. WAAS ground stations use receivers on known surveyed points to collect error data and a network of these stations is required to cover the service area. The error/corrections data is relayed to your receiver from geostationary satellites by being piggy-backed on the GPS frequency. Trimble systems use base station receivers (again set on known points) with either a real-time relay of correction data or saved data to use in 'post processing' as described by bcblues post. The survey systems I worked with (10 years ago) had a single base station that relayed the correction signals using a single radio transmitter to multiple roving GPS receivers paired with separate radio receivers. This allowed for real-time layout and pickup of points in the field. The corrections are for each individual GPS satellite so the general rule is that the base station and the rovers must be able to see the same satellites

Surveyors Do It Differently

You probably want to choose another one: A lot of these are scaled off a map and so will be 10's of metres off. If you're wondering why a benchmark would be so inaccurate, many of these are used for gravity measurements only and have very accurate elelvations. If true that's quite old. Anybody here know if Saskatchewan has an online database open to the public?

How Differential GPS works

Same here except I'm on Win7. Everything worked prior to the update.

Once you signed in look for the CSRS Database Request section and select the Go button. The next screen gives you a number of options for searching including Station Unique Number Search. Note that only federal benchmarks are listed in this database and you may have to look elsewhere for provincial benchmarks. If you can describe the benchmark others here might be able to help you more.

If you need more help there are lots of friendly folks over at the GSAK support forums (link) or have a look at the GSAK FAQ(link)

Duplicate post

Rather than downloading caches one by one as a premium member you can use Pocket Queries to have files of up to 500 caches each emailed to you or download files of upto 1000 caches from the 'Pocket Queries' webpage. See Creating Your First Pocket Query (link) and Pocket Queries: A Detailed Explanation(link) by Markwell. For more info about geocaching with your Oregon see http://garminoregon.wikispaces.com/Geocaching

It looks like the new geo (46 / PRN 133, 98.0°W, Inmarsat 4F3) came out of testing for a while today. Screen shot from Oregon 200

GSAK only supports waypoints (geocaches) and does not work with tracks.

Yes normally. I haven't used the model you mention but with Garmin's you create a waypoint for your present location then edit the coordinates, name, etc.

The new one (PRN133) now appears on http://www.nstb.tc.faa.gov/RT_WaasSatelliteStatus.htm

"October 25, 2010 – The geostationary (GEO) satellite Intelsat (CRW) will continue broadcasting the WAAS signal at least into December 2010." www.faa.gov

See Downloading GPX/LOC Files (link) for software suggestions.