Hello,
1. I am looking for a iMac-based open-sourced program to replace Garmin's MapSource function.
2. Garmin MapSource is only available for Windows-based PC, not Mac.
3. Garmin stopped supporting MapSource with their last update v.16.3 on October 25, 2010, at which time MapSource was replaced with BaseCamp software.
4. I have two Garmin Zumo 660LM gps devices that were built to be compatible with MapSource software (not BaseCamp). MapSource interfaces with City Navigator North America maps allowing users to create custom routes on a PC that can be transferred to the Zumo 660LM device.
5. MapSource is the only recommended software to be used with Zumo 660LM (not BaseCamp). Zumo 660LM devices are NOT compatible with Garmin's BaseCamp, a fact Garmin has reluctantly confirmed.
Since I only have Mac computers, and I would like to use my Garmin Zumo 660LM gps devices, I am looking for a MapSource equivalent to interface with updatable City Navigator North America maps, create custom routes on my Mac, and transfer to the Zumo 660LM device with confidence that the routes are as planned.
Any help would be greatly appreciated
-Steve

Detailed map of USA for Garmin GPS, based on OpenStreetMap data. Size of the map is about 9GB. Maps can be installed under Windows or Mac OSX. Map properties: full range of OSM data; U.S. Geological Survey Land Cover Woodland; NOAA depth contours; elevation data DEM, 3 arc second resolution (SRTM and Viewfinder Panoramas) 25m contours lines. Chrome os apk installer. Create 3D maps and contour plots. Runs on Windows XP/7/8/10 64bit. Multi layers and multiparameter model is possible. 4D grid interpolation in volume. Thanks to Tony Buzan, the inventor of mind mapping, we can quickly organize our thoughts for business or personal uses. Although there are plenty of Mac mind mapping apps available in the App Store, most of them require payment and not worth it just for occasional users. Luckily, here we found the 9 best mind mapping software for Mac. Navigation software to connect your Mac with most GPS receivers. US and Canada MacTopos map DVDs, digital marine charts, MacElevation display, accessories, and great service. Navigate on Topo Maps for the USA (USGS and US Forest Service), and SouthEast and SouthWest Canada iHikeGPS NZ Navigate on Topo Maps for New Zealand and Australia.

Surfit is a computer program which enables to calculate regular grid from various data (scattered points, 2D and 3D contours, surfaces, etc) in different ways (interpolation, approximation, inequalities, etc). Surfit implements the original gridding method.

Garmin Colorado 300 showing routable OSM made with mkgmap

Many Garmin GPS devices can show maps on their display. This overview page explains how you can get OSM maps on your Garmin device.

Pre-made maps

Some people have done the work of creating Garmin maps for parts of the globe. You can download these files and put them straight onto your device.

See OSM Map On Garmin/Download

Creating your own maps from OSM data

Software

Program	License	`.osm` to `.mp`	`.mp` to `.img`	`.osm` to `.img`	IMG aggregation	Routing	Generates .TYP	Generates .TDB	Relief contours	Upload	Developed for OSM?	User interface	Platform
Mkgmap	GPL	no	yes	yes	yes	yes	yes	yes	no	yes	command	cross-platform (Java)
QLandkarte	GPL	no	no	no	yes	no	yes	no	GUI	Linux, Mac OS X, Windows
GPXSee	GPL	no	no	no	yes	no	no	no	GUI	Linux, Mac OS X, Windows
sendmap	proprietary	no	no	no	yes	no	no	no	no	yes	no	command	Linux, Windows
Mapwel	proprietary	yes	yes	yes	yes	yes	yes	no	no	yes	no	GUI	Windows
osm2mp	GPL	yes	no	no	no	yes	no	yes	command	Linux, Windows
OSM Composer	proprietary	no	no	yes	no	no	yes	yes	yes	yes	yes	GUI	cross-platform (requires Java 1.6)
GroundTruth	GPL	yes	no	yes	no	no	yes	yes	yes	yes	yes	command	Windows/Mono (.NET 3.5 SP1 required)
Osm2garminGUI	GPL	no	yes	yes	yes	yes	no	yes	yes	no	yes	GUI	Windows, Linux (Java + NetBeans RCP)

Mkgmap is an Open Source Java program developed specifically for converting OSM data into Garmin map image files. You should probably look at this first.
QLandkarte is an Open Source program to display and work with Garmin maps.
GPXSee is an Open Source map/GPS log file viewer with support for Garmin IMG maps.
cGPSmapper is a program to convert a textual presentation of a Garmin map into binary map files. cGPSmapper can not read OSM files directly. MapCenter is a web interface to cGPSmapper.
sendmap is a companion program to cGPSmapper for aggregating and uploading map images files.
Mapwel is an all-in-one program for GPS mapping. Mapwel supports OSM files and their conversion to Garmin IMG format with routing.
osm2mp can create routable garmin maps, see this forum thread for details and download.
OSM Composer is a GUI for simplifying the process of creating Garmin map images from OSM and SRTM data. It does not generate maps itself but controls existing tools.
GroundTruth is an open source command line application for creating Garmin maps from OSM data. It has a wiki-based rule engine for specifying how map features should look like (which it then uses to generate Garmin TYP files). It can also generate relief contours from SRTM data for Garmin maps. It uses cGPSmapper to generate IMG's from .MP files.
Osm2garminGUI is an Open Source program for downloading/updating OSM Planet file and elevation contours SRTM3 data, extracting data for given regions and processing extracted regions with Splitter and Mkgmap in a single step.

Directions: Creating your map from OSM data

These are generally the steps involved (also see the Software section above):

Get OSM data:
- The easiest way of all is to use the Export tab on the site. This will download the map you have currently on display. Choose the OpenStreetMap XML data option when downloading (active for zoomlevel >= 11).
- If you want an entire country or maybe even the whole world, use the planet dump or one of the many excerpts available.
- You can use JOSM to select and download the data, then choose Save As. (But note that this is inefficient for large data sets, as JOSM will attempt to draw the data, which can take many minutes, and which you don't need to do if you're only trying to use the data on a GPS unit.)
- For a command-line download, see Getting Data or GroundTruth For Dummies#Downloading OSM Data.
- If you are writing software, download through the XAPI.
Split large area: If your area is a big region or a whole country before compiling OSM data to a garmin IMG file you need to split it with : Splitter
Convert to IMG file: You need to convert the .osm file to a Garmin map image file (.img). You should probably use Mkgmap or GroundTruth for this. Mkgmap will not process arbitrarily large input files, so you probably need to cut the osm file into smaller chunks, most easily with the new splitter.
Creating GMAPSUPP.IMG files (optional): If you would like to directly upload your map onto your Garmin GPS you need to pack your IMG files into an aggregate image file called GMAPSUPP.IMG. Mkgmap and cGPSmapper perform this process. Programs such as sendmap and MapSource create this file automatically when uploading files. If you plan on using these p

Contour Map Program For Mac Opensource