Few things to know about the map
This topographic map represents Ireland. It is designed for "hillwalking". The contour lines are extracted from SRTM public data provided by NASA. These files contain a digitized ground represented by points. The sample rate defines a grid resolution for Ireland around 90m in northing and 60m in easting. In major cases, digitized points do not correspond with summits. Carrauntoohil (1039m, the highest summit of Ireland) does not appear in SRTM data. The altitude reaches only 1018m.
Data were obtain from space with a radar. Because of the relative position between the radar and the earth, a shadow appears in some conditions (along ridges, behind summits...). This shadow matches with a gap in data (Imagine you with a flashlight in a dark room. It is hard to see what is in shadow). To close these gaps, you need other data or you can do interpolation. The second solution is applied in our case. There is one square degree per SRTM file with a sample rate of 1200x1200 points/square degree at Ireland latitude.
For smoother contour lines, oversampling with interpolation can help. This process is like erosion on mountains and it depends on what kind of interpolation is involved.
For version 1.62, B-Spline is applied once for merging all files and once for oversampling. The result is the altitude range [0 - 1002.5m] after the first step and [0 - 997,5m] after the second one (highest point is 1018m in original data). This is the reason why there is no 1000m contour line.
For version > 1.62, data processes has been done again from start. This version is based on SRTM oversampled 3 time (9 times more data or 1.44 Go).

All in all you obtain contour lines pretty sufficient for walking.
Remember this : a map is not the ground, it is an abstraction which helps to define the place where you are.

WARNING
Because of the nature even of the irish mountains and fast change of the weather conditions, hillwalking presents risks. Leave equipped, protect nature by keeping your waste, respect private properties.
A GPS receiver is only a secondary means for navigation. Map and compass remain necessary.
The author of the map ''Ireland'' declines any responsibility in the event of injury or worse, for any damage on your GPS and lost data.

Notice (version > 1.70)
This topographic map represents the main isle called Ireland. It is intended for the practice of the excursion also called "hillwalking". Contour lines were extracted from SRTM data with a native resolution of about 90m x 60m, oversampled with a factor of 3 and a bicubic spline interpolation. The result is a terrain a little bit eroded but with smoother curves. The step between contour lines is 10m at the lowest scale. The map includes levels of details with 25m contours and 100m contours. Mountains areas are displayed with colors for any altitude higher than 100m. The map includes the name of the geographical areas and all summits higher than 400m.
The map has not yet been tested in Ireland (maybe next holidays ?).

This map was carried out with the authorization of use of MountainViews for summits data and The Scottish Mountaineering Club for other toponyms. Contour lines are built from SRTM data provided by NASA. Data for lakes, rivers, roads, urban areas come from OpenStreetMap.

The map "Ireland" is under a Creative Commons Attribution - Noncommercial - No Derivative Works 3.0 License. It means you can use it only for a free and private use. Any derivative map distribution, paying use is prohibited without author's agreement. Moreover, selling is also forbidden (related to software license used to build the map). Data from OpenStreetMap are licensed under Creative Commons Attribution-Share Alike 2.0. That is why they are contained in a specific layer.

Etrex Vista HCX screenshot v1.70 Etrex Vista HCX screenshot v1.70 Etrex Vista HCX screenshot v1.80

INSTALLATION & USE
To install the map, launch the setup program and follow the instructions. The Map will be available into your Mapsource product.
To upload the map in your GPS, use sendmap or a Mapsource product. To adjust level of details, do it in the maps menu on your GPS.

TIPS
The map is made with many layers. Some of them are transparent ad can be displayed with Mapsource products. To display them or not, adjust your map settings in GPS menu.
Levels of details are tuned for "normal" setting. To display more details, adjust your map settings in GPS menu.

Using Ireland Map whith Mapsource product
To display both Ireland Map and Mapsources product needs to patch some files. The tweak was applied successfuly on Metro Guide v7 and City Navigator Europe.
Do it at your own risk.
  1. Open with GPSMapEdit the main TDB file found in your Mapsource product directory to find maps files corresponding to Ireland
Nota 1: always select Ireland background map when you download your patched files unless you will see the base map too.
Nota 2: do not change Ireland Map transparency.


Notice (version < 1.70)
The step between curves is of 25m at the lowest scale. The map includes the name of the geographical areas and all summits higher than 400m. The mountains areas are displayed as polygons for any altitude higher than 250m. Data were tested by the author during 19 excursions with a GPS Garmin Etrex Legend (Wicklow, Knockmealdown, Mac Gillycuddy's Reeks, Burren, Maamturks mountains and Donegal).

The approximation of the contour lines is related to the inaccuracy of the data available.

WARNING
Because of the nature even of the irish mountains and fast change of the weather conditions, hillwalking presents risks. Leave equipped, protect nature by keeping your waste, respect private properties.
A GPS receiver is only a secondary means for navigation. Map and compass remain necessary.
The author of the map ''Ireland'' declines any responsibility in the event of injury or worse, for any damage on your GPS and lost data.

This map was carried out with the authorization of use of MountainViews for summit data and The Scottish Mountaineering Club for other toponyms.
The map "Ireland" is under a Creative Commons Attribution - Noncommercial - No Derivative Works 3.0 License. It means you can use it only for a free and private use. Any derivative map distribution, paying use is prohibited without author's agreement. Moreover, selling is also forbidden (related to software license used to build the map).

Etrex Legend screenshot
INSTALLATION & USE
Use with Mapsource
The map's integration in a Mapsource product is a delicate operation for a novice. A wrong Registry modification can corrupt your Mapsource product or your system. To install the map follow these steps:
1) place the files "Ireland.img" and "Ireland.tdb" in "C:\myMaps" and "10000102.img" in "C:\myMaps\imgs"
2) create the following register's key in order to make available your map in Mapsource's menus.

[HKEY_LOCAL_MACHINE\SOFTWARE\Garmin\MapSource\Products\Ireland]
"LOC"="C:\\myMaps\\imgs\\"
"BMAP"="C:\\myMaps\\Ireland.img"
"TDB"="C:\\myMaps\\Ireland.tdb"


Download the map in your GPS Garmin (with sendmap or a Mapsource product) and adjust drawing options to increase the level of detail.

TIPS
The map is transparent, it means you can use it with other maps and you can display them simultaneously. Levels of details are tuned for "normal" setting. You may adjust the display zoom level for POI at "5km" if you want to see summits name with a large scale.
 


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under a Creative Commons Attribution - Noncommercial - No Derivative Works 3.0 License.