When the Magellan Triton 2000 GPS came out, I was in the market for a new GPS unit, as my Garmin eTrex Vista had been stolen.
I was immediately frustrated with the lack of a useful base map on the unit, and with the cruddy TOPO Explorer software they provided. After some months National Geographic finally updated the software and made it usable. I downloaded some maps from their online map store, and though that was pretty cool. In fact, I was very impressed with the ability to get hybrid maps that included sattelite imagery as well. I used these on my recent trip to Colorado’s Flat Top Mountains.
What has vexed me with this device, as with so many other GPS units, is the inability to add custom maps that don’t come from Magellan, Garmin, National Geographic or some other costly source.
I recently became interested in trying it again, and found some tools which, when put together, provide a free, if technically cumbersome, way to put custom raster maps onto your Triton.
The first step is to get some digital map/chart content. Fortunately NOAA gives us that for free. You can download “BSB” files from them, which contain a combination of textual data and imagery, for use in a GIS. GIS, or Geographic Information System, is a piece of software that interacts with map and other data.
Once you select the area you are interested in, and download the charts you want, you can unzip them on your computer. Once unzipped, you will see a BSB_ROOT folder, which contains a numbered folder that corresponds to the number of the NOAA chart. In that numbered folder will be a .BSB file and one or more .KAP files. Each .KAP file contains a map image that we want to extract to a TIFF.
BSB files are a proprietery format, so it takes some doing to crack them open and get at their content. Fortunately, some people have already reverse-engineered the BSB/KAP format. You can download a set of BSB tools to convert the BSB files to TIFF format so they can be manipulated in normal image editor programs.
Run the following commandline to convert your KAP files to TIFF.
bsb2tif {input filename}.kap {output filename}.tif
You will then have high-resolution TIFF tiles which you can view in normal image tools.
The final step is to convert these TIFF files into a usable format for your GPS unit.
Once again, someone comes to the rescue with a very good free tool to generate the RMP (Raster MaP) files, which are Magellan’s proprietary format for raster maps. A raster map is simply a raster image (bmp, jpg, gif, etc) which has been calibrated to fit a given coordinate system. Triton Raster Map Maker is a tool that will generate RMP files.
At this point, you have already downloaded your NOAA charts, extracted the KAP files from the zip and converted the KAP files to TIFF. The next step is to import a KAP file into TritonRMP.
TritonRMP allows you to select spots on the map as reference points, which correspond to LAT/LON coordinates. Fortunately, the NOAA charts all have LAT/LON lines on them, so finding spots to use for calibration is easy.
After you have done the calibration, click on Generate RMP. You can name the file anything you like, as long as it is a valid Windows filename.
Copy the RMP file to the SD card you use in your Triton, in the MAP_DATA folder. When you re-insert the SD card, go to the Menu -> View -> Maps option, and select the named map you have added.
Sometimes, the maps won’t work correctly. I don’t know why. I have experimented with resizing the maps to a lower resolution, which seems to help. Unfortunately this process can take some trial and error, but it’s worth it to be able to put any kind of raster map you want on your GPS.
I extend a sincere thank-you to all of the people who developed the wonderful free tools that allow us to take full advantage of the Triton 2000 GPS’s raster map capability.
And as always, when navigating, remember that GPS is fallible, and should always be a back-up to your primary form of navigation. NOAA also states that the electronic charts are for reference only, not for navigation.
Happy trails!