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Are you saying - take the newly updated card (from mapsource) out of the GPS, put it in the computer and transfer the maps from the previous card to it? I know when you use mapsource to transfer new data it wipes out the old, won't that happen in a micro sd card to micro sd card transfer? will the GPS read the old and new data?

Precisely why Red90 suggested......

What I would do is rename that gmapsupp.img file to something else that works like gmapprom.img.  Then send the new maps to that same card.  They should then both work.

MapSource is the correct software for the 60cx, and will allow you to accomplish what you desire by selecting a map, choosing which tiles to include, then selecting the next map and wanted tiles, etc. etc. The tile list will grow in the window to the left of the map view, and a total map size and tile count will also be visible.

When all map tiles have been selected, rename the map if desired, and send to your device.

The mapset will be saved to the 60cx as gmapsupp.img, overwriting any existing file.

The 60cx will allow you to enable individual map segments as needed.

Thank you Boyd! I need to set some time aside to experiement with the scripting function until I learn how to do exactly what I need.

My current work around is to import the first shape file, assign a typ style (trail, for example), then import the newer shape file and assign a custom typ style I have titled 'New Track'. The 'Trails' are small dashed red lines, while the 'New Track' style I created is a much wider black line that looks like RR tracks. The two style contrast well, and I can easily 'see' the polylines that do not match, but I have to manually find and select each of them, assign a third typ style, then eventually delete the original polyline styles from the map, leaving me with what amounts to the map delta.

Then I can apply this new data to my existing map file, and repeat the process for each new polyline, checking google maps etc for errors and making necessary corrections.

Mapping trails throughout the southwest USA, it ain't no simple task!

I have been researching the scripting features of GlobalMapper, but I am unable to find any complete documentation that explains how to write the scripts. GM has a general reference page that describes some (but not all) scripting commands but does not provide proper usage information.

SO far I can see I will need to use the  EDIT_VECTOR script command with DELETE_DUPLICATES=YES, but I am unable to determine anything beyond that.

Perhaps my total lack of experience with scripting is holding me back here?

Anyone here have an effective method of comparing two shape files for the same area to filter out duplicate data?

Purpose: After using OSM shape file data to create a map, and editing out unwanted data or correcting inaccurate data, one can not simply import a newer shape file with updated information without reintroducing previous errors and omissions. I wish to compare two shape files and determine what has been added to or changed in the new file and discard the remaining older data.

Sadly Garmin doesn't make it very easy to enable and disable layers.  My Arizona maps have similar problems because the NHD water data shows water that could be there even though most of the time it isn't.  With that said, a lot of people like the boundary information because the type of land you are on is very important to hunters.

I did not mean for you to include the boundary information as a layer in your map, I have separate maps just for this purpose I can enable/disable at will along with the topo I am using at the time. You could compile a second transparent boundary map so users have the option of turning them on and off. I only offer this suggestion because you wanted to know our opinions

The weakness, as always, is trails.  The data just isn't available in any sort of excellent centralized location or format.

I am working on that, for the southwest USA. NW Trails has excellent coverage for the northwest USA, and MyTrails has very good eastern USA coverage.

It is odd in the screenshot how different the water shows up.

A simple TYP file edit could probably solve that

babj615 - I do not think simply saying you 'favor' some mapsets over others without providing your criteria is helpful to possible users, map authors, or those considering becoming authors or sharing their creations.

Sorry for the delayed response, I have been very busy learning how to create my own maps

Some excellent observations are noted by vintage in this post:

Here are two samples from around N32.59068 W116.71972

California Topo:


or this
catopo11


The newer catopo11 map has land areas marked for some reason (I have no idea what those are) and lots of watercourses (Hah! This is SoCal, no water really exists except for the rare rainstorm). But note the missing trails.

The older California Topo map has all the dirt roads/trails and much easier to read gradients (IMO).

Which do you prefer? I think the old map is much better for hiking...
Carl

I primarily use topo maps for the purpose of hiking.

In the two examples shown, I much prefer the contour lines in the catopo11, but that is about all I prefer from that mapset. Hydrology, IMHO, should be less dominant, and I prefer having separate  transparent mapsets for viewing property boundaries of most types (exluding state and national parks and forestry).  City, county, BLM, private, public, etc. (when included) can make the map quite messy.

Garmin also insists their GPSr units can display a maximum of only 20 Tracks on the map screen at any given time.

http://img844.imageshack.us/img844/4706/s86.gif

What operating system are you using when you format the 32GB uSD card to FAT32?

This is a BaseCamp/MapSource/Garmin issue - nothing wrong with the GPSr itself, just Garmin very strict adherence to the standard GPX structure.

I also favor the older topo maps over the 2011 versions for the states I have downloaded.

The majority of my new Garmin GPSr units have had issues within their warranty period, and the refurbs that replaced them are all still going strong, some many years later. You will likely now have a better GPSr than you originally purchased

Might want to try the free trials from

ExpertGPS: http://www.expertgps.com/

and

TopoFusion: http://www.topofusion.com/

Somewhere there is a setting that causes the data to generalize when imported.  Make sure that is off.

Oh yes,

Tools > Options > Edit > Snap to grid is disabled!

Is it possible the cgpsmapper manual has a typo, and the maximum level is actually 1.0, with a range from 0.1-1.0?

This would suggest that this value decides the percentage of points retained during simplification, where 0.1 = ten percent, 0.5 = fifty percent, and 1.0 = one hundred percent (or NO simplification), which would explain why I see no change between using no value (default = 1) and using value=10.

I'm using value 2 and it gives different results than default. Simplification doesn't count percents. When a sequence of points lies on a nearly straight line, simplification removes intermediate points. Parameter decide how far from straight line points are removed. See description of algorithm:
http://en.wikipedia.org/wiki/Ramer%E2%80%93Douglas%E2%80%93Peucker_algorithm

I had looked at that page yesterday, and the example they give simply shows every other point being removed. I did not see anything in the Wikipedia article that equates to the cgpsmapper 0.1-10 scale.