snowfleurys

Most mapsets are in the range of 10-30% larger after installing the downloaded. I would expect the entire FL topo to use between 150 and 180Mb.

The Ibycus topo vector data came from the 1:50,000 scale printed topo maps. That is 10 times more detailed than the 1:500,000 scale topo maps you are thinking about scanning.

However, when this is done, many have stated this makes the map difficult to use for their purposes. As is often the case, no one presentation will best for every specific purpose/user.

That is something the map author decides on when the mapset is created. The user's option is Most/..../Least. If the areas are very small, the build software will drop them from a zoom level if the coordinates would be the same.

See gpsfiledepot.com for maps and tutorials on how to install them and load segments/quads to a Garmin GPSr.

Garmin's BaseCamp software is somewhat a replacement for MapSource. You can download it free from Garmin's website. After installing BC, you used to be able to also download MapSource for free. You have to use software to upload map data to the DK20. It will recognize map data placed on the card in the proper folder. Individual mapsets can be 'turned-on and off' within the DK20.

Check their website. They used to sell a program to convert map data to the format their GPSr's use.

As dxf noted: if the topo mapset is overlay/transparent and if you have one of the newer units. I am not aware of any topo mapset that is transparent. The State contour line overlay/transparent mapsets at gpsfiledepot should work with CN, OSM, and Ibycus USA and makes the combination a topo map. Displaying a topo mapset with another mapset would not work too well as the same information (roads, streams, etc.) would be in both mapsets and probably from different source data. Sending the data as a single gmapsupp.img file as you mentioned or as seperate files and renaming each depends on which GPSr you are using.

Most map authors who use GPSfiledepot to host their mapsets have both a PC and a MAC version for download. Use Garmin's program for the MAC to view and transfer data to the GPSr.

It is considered best not to place any addition mapset data on a Garmin prerecoded micro memory card. Data from overlay/transparent mapsets should go on the units internal memory - make a backup of what was on the unit when it came from the factory.

At the bottom of the selection window in MapSource is a running total of the number of segments/quads and their total size. You will likely get to the 4000? (more like 3860) segment limit before you reach 4Gb. For the 'newer' units (OC, OR, DK, 78, 62, MT), send a mapset to the unit. MS/BC uses 'gmapsupp.img' as the file name - rename this to somename with a .img extension. The the same for additional mapsets.

See: http://www.gpsfiledepot.com/tutorials/how-to-open-maps-in-mapsource/ & http://www.gpsfiledepot.com/tutorials/how-to-load-maps-on-my-garmin-gps-unit/

The usual advice is NOT to add any other mapset to a Garmin prerecorded SD card.

Many of the published USGS topos in CA use a contour interval of 40', or even 80', because of the steep slopes. Anything less would be result in lines 'running together' at 1:24,000 scale. Similiar situation for GPSr mapsets, which also have to use appropriate zoom levels. IMO since the gridded data (used to construct the contours) are usually created from the contours on the printed USGS maps, using a more detailed CI is similiar to enlarging a printed map and drawing in CI's between the existing one; they may look nice, but are those new lines really where the elevations are?

I do not know about the OR450; however, I have a 16Gb micro card in my OR300 with over 10Gb of map files on it and it is working fine. FWIW - you can ask 3 Garmin techs the same question and get 3 conflicting answers.

For maps of the UK, check the talkytoaster website.

The shading can be turned off. Doing so results in an off-white background versus the medium tan with shading turned on.

On my OR300, gmapbmap.img is the Garmin world basemap; gmapsupp.img is the filename used by MapSource/BaseCamp when these programs send map data to the GPSr.

You may exceed the segment limit before memory becomes an issue.

CN takes presidence over any other non-transparent mapset. Disable it and the topo mapset should be visible.

Do a google search on Thailand gps maps. I see many listed as free.

TheLoneGrangers - The only SC topo on gpsfiledepot downloads as a selfinstalling .exe file (or equivalent for the MAC). When you run that file, it 'unpacks' the .img, etc. files and make the necessary changes to the registry. cgpsmapper is used by map authors to compile the .img files from source files and except for a coastal quad containing a small amount of data would have taken a lot longer. Possibly you had MapSource open when you ran the .exe file - MS (and BC) only check the registry for mapsets when they are started. Which tutorial were you using? And why?

That mapset comes as a self-installing .exe file. All you need is MapSource or BaseCamp - either will upload the mapset or portions of it to your GPSr. I believe you will have to use BaseCamp to move the geocaching information to and from the Dakota. Also see the tutorials at gpsfiledepot on selecting and uploading map data to the GPSr (do NOT use MapSetToolKit - that method is 2-3 years old and is for mapsets which do not come as self-installing .exe files).

Consider making one yourself, you could make the quality as good as care to; then share it with others.

Most of NJ topo maps at gpsfiledepot use a contour interval of 20ft - which is about what is on most of the printed USGS 24k topo quads.