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Known issues

Garmin maps format is not public, so map generation process (done with mkgmap) is based in reverse engineering. As format has not been completely deciphered yet, there's still a number of problems affecting the maps. They have the advantage that data on them are most probably more up to date than commercial ones, although in some areas coverage is lower. Another great advantage is that anyone can complete or correct missing or wrong data. Below there is a list of known issues regarding the use of the maps.

  • Address search: in order to find a given street using 'Search by address' option of the GPS it is necessary to type the name of the street exactly as it is on the map, e.g. 'Calle de los Derechos Humanos' (Human Rights Street). It may be a problem for languages like Spanish or French, in which the name of the way is preceded by the type of way: Avenida de América, Paseo de la Castellana, etc. as it will be difficult to know how the name of a street is in the map: it may be Calle Derechos Humanos, C/ de los Derechos Humanos, Avenida América, etc.
    To avoid this, some changes are introduced that let you omit the type of way and also particles before the main part of the name. For the examples above, typing “Derechos Humanos”, “América” or “Castellana” will be enough. Some irrelevant words common at the end of street names, like Avenue, Street, Road (English), Strasse, Weg (German), kalea, bidea (Basque), etc. are also removed.
  • Roundabouts exit number: if a way entering a roundabout shares a node with an exiting way, that exit is not taken into account for the 'Take exit # to the right' instruction, although on screen it is correctly displayed. In fact, it is caused by errors in the data used to generate the map, and must be fixed on OpenStreetMap data.

Correct and wrong roundabouts

  • Advanced functions: some advanced functions, such as lane indication, on screen speed limit display, crossing search, etc. don't work.
  • Topographic maps on MapSource: contour lines behavior in MapSource is quite variable, some times they are displayed and some times they are not, without a known motive, just showing the number that indicates the height but not the line. However, although they are not seen, they are there and can be used, for example, to calculate a route profile (Edit menu->Route Properties->Show Profile...). On BaseCamp and QLandkarte GT this problem doesn't occur.

If you detect any other problem in the maps, other than those due to errors or lacks in OpenStreetMap data, please use the comments at the en of this page to report it.

You can leave your comments on this page below:

Comments (26)

Topic: Problems
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Brian Stanfill (Palmer, Alaska, usa)
Thank you very much for your continued effort! I'm a very satisfied customer and am using these maps for a tour of the Americas. They are getting better all the time. Will you consider NOT using yellow for a road color? It is the one color that is impossible to see against the background on my GPS in daylight. For me, contrast is more important than the colors indicating road type. Rarely does the color actually correspond to the quality of the road anyway. Thank you! Brian
Admin:
I'll have a look at it. There are two options: changing background color to white or changing yellow tertiary roads to some other color.
20th October 2014 2:33am
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JUDE ARANHA (Switzerland, switzerland)
I would like to make a payment but in addition to the IBAN (which I have from your web site), I also need beneficiary name, city and postal code.
16th May 2014 11:23am
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RAMESH (MOROCCO, morocco)
Are these maps compatable with Tom Tom devices?
Admin:
No, just with Garmin devices
14th May 2014 12:02pm
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Santa Julia (Siem Reap, cambodia)
I want OSM for Cambodia to use it in Mapsource
Admin:
http://mapas.alternativaslibres.es/moremaps_en.php
27th February 2014 4:12am
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Franz (Regensburg, Germany)
to the problem with invisible contour lines on topographic maps: they just have the same color as the background, change the color in the type file and they'll be visible
2nd February 2013 11:31pm
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