GPS question...Osseo Trail?

[yvon]

You can get the upgrades from the Garmin website (http://www.garmin.com) or from http://www.gpsinformation.org/perry/.

Doug

The http://www.gpsinformation.org/perry/ do not work anymore, is anybody have the new address or it does not exist anymore.

 

[DougPaul]

The http://www.gpsinformation.org/perry/ do not work anymore, is anybody have the new address or it does not exist anymore.

Moved to http://www.gawisp.com/perry/agree.html.

Doug

 

[yvon]

Moved to http://www.gawisp.com/perry/agree.html.

Doug

Thank you Doug.

 

[Amicus]

You can place waypoints in MapSource by clicking on the desired locations while in waypoint mode and then transferring them (electronically) to the GPS. Much easier and faster than placing the waypoints in the GPS manually.

I do this too, except that, instead of MapSource, I use Nat Geo Topo, which has much more accurate maps and so, I assume, is more likely to give me an accurate waypoint. While only MapSource maps can be downloaded onto a Garmin GPS, it will take waypoints (or routes) from Nat Geo.

 

[DougPaul]

I do this too, except that, instead of MapSource, I use Nat Geo Topo, which has much more accurate maps and so, I assume, is more likely to give me an accurate waypoint. While only MapSource maps can be downloaded onto a Garmin GPS, it will take waypoints (or routes) from Nat Geo.

Either works for tracks and waypoints, but you may be comparing 100K scale Garmin maps to 24K scale NG maps.

Garmin US Topo 2008 is based upon the USGS 100K scale topos. Garmin also offers 24K scale maps for a number of regions. Both are in DLG (digital line graph) format.

NG TOPO! NE contains both 100K and 24K maps which are DRGs (digital raster graphics) or images of the corresponding USGS paper maps.

Presumably the accuracy of both formats is the same for corresponding scales. DRGs tend to look nicer than DLGs, but the basic information and accuracy is the same. DLGs are smaller than DRGs and can be displayed at a much wider range of scales. DLGs can be downloaded to Garmin GPSes by Mapsource, but not DRGs.

Doug

 

[Amicus]

Either works for tracks and waypoints, but you may be comparing 100K scale Garmin maps to 24K scale NG maps.

NG Topo 24K to the Garmin 100K is not a fair comparison, I admit, but the Garmin Nat. Park 24K (not in fact limited to Nat. Park land, fortunately - includes BaxterSP and much other prime hiking terrain not in any Nat. Park) is apples-apples, and NG Topo wins easily, to my eye. The Garmin maps have all kinds of random, sometimes funny, errors that I don't find on NG Topo.

 

[DougPaul]

NG Topo 24K to the Garmin 100K is not a fair comparison, I admit, but the Garmin Nat. Park 24K (not in fact limited to Nat. Park land, fortunately - includes BaxterSP and much other prime hiking terrain not in any Nat. Park) is apples-apples, and NG Topo wins easily, to my eye.

Yes, the DRGs are nicer to look at than the DLGs, but the accuracy of the contours (of the USGS-derived ones) are probably pretty similar. Garmin is coming out with regional 24K topos that will probably include the NE. Unfortunately, they are available only on microSD (or equivalent), so you cannot view them on your computer (GPS only).

FWIW, the AMC WMG trail maps are mostly 95K scale--fine for trail hiking but a bit lacking for bushwacking.

FWIW2, I often prefer the 100K maps on my GPS over the 24K maps because there is less clutter on the small screen.

The Garmin maps have all kinds of random, sometimes funny, errors that I don't find on NG Topo.

Yes, there are some artifacts on the Garmin maps. They appear to mostly be labeling problems and some missing trail sections rather than topographic errors on the sections that I have examined.

Doug

 

[RoySwkr]

Yes, there are some artifacts on the Garmin maps. They appear to mostly be labeling problems and some missing trail sections rather than topographic errors on the sections that I have examined.

The Garmin maps shows the summit of Snows Mtn in a different place than the USGS, the USGS is correct