< OSM Map On Garmin
Compiled maps for Garmin don't seem to have postcode search function.This is a hack to enable a UK postcode search set on a Garmin Nuvi 255W, and I hope it would work similairly with others. Hope it helps you, as this was (until now), my main bugbear with OSM on a Garmin. With this hack, postcode coverage is better that that I have with the original Garmin maps (now 12 months out of date), and I didn't want to waste my money on an upgrade to fix this with no guarantee it would be much better with their current generation UK map.
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Step One
Download CodePoint Open list of postcodes and grid references from OrdinanceSurvey https://data.gov.uk/dataset/89a37a30-925c-4185-9ff9-c414dfb0de8b/code-point-open. Extract it wherever you like. Alternatively MySociety [1] make a version of CodePoint Open which has already been converted to WGS 84 lat/lon, which means step two might be unnecessary, and may save a bit of grief. SK53 23:11, 15 May 2011 (BST)
Step Two
Convert from eastings/northings to latitude/longitude. I used the Excel functions for doing this from Phil Bradyhttp://www.haroldstreet.org.uk/osgb/excel-conversion-code/ (because I had them readily available), and ended up writing the following code to convert directly to a reduced CSV file.
- Even if you have an unlocked version of his worksheet, I would suggest you create another workbook, add a VBA module to this (Alt-F11 to open the editor then Insert/Module, and paste the Conversion Code at the end of this page)
- Edit the two directory lines to point to your codepointopen postcodes_gbData directory, and your desired output directory.
- If you want to convert to GPI files with GPSBabel, then ensure bmpName points to a valid icon file, and uncomment the block of lines at the bottom which include oExec (uncommenting just means deleting the ' character from the beginning of the line).
- Run the routine to create the simplified files (F5 while your cursor is in the createPostCodeFiles code). NB you will need both files open in Excel simultaneously.
Step Three
Graphic node bundle for wedding 1 2 download free. If you haven't already done it in the previous step, use GPSBabel or similar software to convert your desired postcode coverage files to .GPI format
Step Five
Backup your POIs
Step Four
Copy the resulting file/s to your garmin device (under the directory X:GarminPOI (either on the onboard memory or on the memory card). If you put it on the memory card when it first reboots it will ask you if you want to install it permanently on the device. Initially I'd suggest not until you've checked it works properly for you, as it's a pain to have to do a mass delete and reinstall of all the POIs.
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Step Five
Search for your Postcode in the installed POIs. On the Nuvi this is via Where To/Extras/Custom POIs/All Categories/Spell. Not sure how it will work on others tho.
Conversion Code
Alternative method
I have had successful results creating an OSM-format file and merging it with a downloaded OSM file using osmosis. Postcodes can then be searched for using Where To? -> Cities, and results are returned extremely quickly. 1blocker 1 4 5 download free.
As a prerequisite it is necessary to be able to have the latitude and longitude of each postcode. Two possible mechanisms have already been described above.
The format of the file is as follows. This example shows a node corresponding to the fictitious postcode XX12 9TY at longitude 50.1234567°N 2.3456789°W.
In the above it is important to note the following
- The max/mins in the bounds record should encompass all postcodes' latitude and longitude;
- Latitude and longitude must be to seven decimal places;
- The node ID's need to be unique and preferably a few orders of magnitude higher than the highest value node ID in the OSM database. Good results have been had with node IDs from 1152921504606846976 (2^60) upwards. A conflict with an OSM node ID can cause several undesirable effects, such as a road extending in a straight line for the entire length of Britain if a postcode node id happens to conflict with a road node. The use of negative node IDs, whilst it used to avoid conflicts with OSM node IDs, does not seem to work with current builds of mkgmap, which are all fully 64-bit compliant and seem to expect a node ID to be an unsigned integer.
- The attributes 'user', 'uid', (possibly) 'visible', 'version', 'changeset' and 'timestamp' are clearly of no significance as far as the resulting map is concerned, but mkgmap complained when one of these was absent. I did not investigate this further, instead I simply included all the attributes found in an OSM extract.
- The postcode should ideally be formatted to have one (and only one) space between the outgoing and incoming part. The incoming part is always one digit and two letters. The OSGB extracts have postcodes 'centre justified' in an 7-character field, for example 'L1□□2AB', 'AB1□2CD', 'SW1A0AA'. The ONS postcode file includes the postcode correctly formatted. A C# function to format a postcode is shown below - this includes a sanity check to avoid an exception if a short string is supplied to it.
In the 'points' style file I resolved amenity:postal_code to a 'hamlet', viz:
The reason for selecting this point type, is that hamlets are the smallest settlement returned in city searches. For best results, the TYP file should contain a transparent image for points of type 0x0b00.
In order to combine the postcode OSM file with a downloaded OSM extract, an osmosis command similar to the following can be used. This example assumes the postcode file is called ukpostcodes.osm, and it is being combined with the Geofabrik British Isles download.
Alternatively, osmconvert can be used, as follows. In this example, the combined file has the o5m format.
Either way, the combined file can be processed, as normal, with splitter and mkgmap.
The resulting map will allow searches for post code using Where To? -> Cities. Searches for distant postcodes are more likely to work because city searches work worldwide (or at least as far as the basemap extends) whereas POI searches - even for built-in Garmin POI categories - seem to have geographical limitations. Also city searches seem to be better optimised than POI searches, so results will be returned more quickly.
When mkgmap is run specifying the bounds.zip file, all entities (including 'postcode hamlets') will be allocated to the country, county and district specified in the bounds file.
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