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After more than a decade, Emerald Island will stop. A new website will take over. The Emerald Island GPS Map will be still updated at least once per year. available at


Garmin Basecamp bug

The map will be broken on Garmin Basecamp 4.7.0, more exactly it will not work with MapInstall 4.2.0. It works with the previous version MapInstall 4.1.1 from Basecamp 4.6.2/4.6.3.
More information from



V2.0.9 Light & Shadow

2018/02/25 : Windows installer is working !
2018/02/21 : initial publication

Be cautious with this new release as you may dislike changes. You should save your previous maps installation for an easier restoration.
  • Include shadow rendering !
  • OSM layer updated (2018/02/18)
  • TOP layer updated with MountainView data (2018/02/19)
  • OSM style updated slightly
  • No more installer for MacOS (not really needed with BaseCamp & MapManager, see installation instruction)
  • Map produced only with open source softwares and custom tools on a Linux computer (no more Windows!)

Known issues :
  • For faster display, disable DEM layer
  • Routing is experimental, it depends on data and compiler capabilities
  • Some shadow artifacts, especially along shorelines (due to original data)


makeTYP tool is an experimental tool which is able to customize the rendering of your maps on Garmin GPS. First release is available More info...


Bug reports and feature requests.


What's inside ?

Emerald Island GPS Map is based on free open data and tools. Data come from MountainViews, OpenstreetMap, megalithomania and USGS.

MountainViews OpenStreetMap
Megalithomania USGS

MountainViews summits
Data are provided by one of the best hillwalking online resources for ireland. Created by Simon Stewart, MountainViews is the place to begin for enthousiast hillwalkers in Ireland.

OpenStreetMap data
OpenStreetMap is a free open mapping project. Like Wikipedia, anyone can contribute to this great project.

megalithomania - The home of Irish Prehistory - provides some data about Ireland's prehistoric heritage (rock art, ogham stones, stones, tombs, burials, holy wells, fortifications...).

SRTM data
Elevation layer (contour lines)
Shuttle Radar Topographic Mission data (SRTM) used for the map are the one with 1 arc-second resolution (i.e. nearly the same as a 30m grid samples). Increased resolution does not mean necessarily a better precision.
What it means for hill walkers, the contour lines will give you a good idea of the terrain around you with an horizontal approximation of 100-150 meters and +/-10 to 110m elevation error. Do not expect avoiding a cliff with your eyes locked on your GPS screen.

A thought about walking in Irish Mountains

Despite their small height, irish mountains are true mountains. Do not underestimate the difficulties. Before to conquer a summit, check the weather and bring with you clothes you will appreciate to wear if bad conditions catch you. Take enough water and food for all members of your party.
Remember you that a GPS receiver is only a secondary mean for navigation. Be sure to be able to find your way back home without your GPS (bringing a paper map and a compass may be a good idea).
If you use to walk only on well marked trails, irish mountains may not be well suited for you, the ground can be "a little" wet and slippery, even on a steep ground. Nevertheless few summits have some more or less marked trails (and not all are official).

Keep in mind this rule : bring back with you what you bring in mountains. Nature is fragile, preserve it.

Download links


By downloading the software, you accept the warranty disclaimer and the software license agreement.


GPS files From Google Drive
The link below provides IMG file for your Garmin device.
Put IMG files in a folder called Garmin at the root of your GPS SD Card (avoid to use internal memory to prevent any error).

GPS files
MD5 : b7b92dc7caa231505b601210998ab97f
SHA1 : 56d48b67c16a52bd22b8d9d2bbd5f9ed1f0e0f5a

Files for Windows OS From Google Drive
Click to download
MD5 : 78acff58d6587ce84fcaaa689ad56bab
SHA256 : 8c2b2895ced54c09b202e537d43562f6ff20550b
Files for MacOS From Google Drive
Click to download
MD5 : 2d16e99497ea1915ba47799b3c183525
SHA1 : fbaf9199fdda6ae4e796aa0f36b2549c2c339492



Why donate ? Since 2006, Emerald Island map is available for free because it is built with free data according to their authors and my wish. Garmin GPS devices evolve with new mapping features and I cannot test without one. Donations will be used to buy a new Garmin GPS device and, if needed, softwares. Any surplus money will be used for hosting the website, sponsoring other projects about mapping or for a humanitarian association.
If you click on the "Donate" button, you will be redirected to a Paypal form.

Warranty disclaimer and software license agreement

(Because some people think if anything goes wrong, someone else should pay for their misfortune)

The software refers to all the distributed files that constitute the Emerald Island Map / Emerald Island GPS Map.
Users includes you.
Authors refers to people who contribute to produce data included in the Emerald Island Map and the software itself.

Users of the software must acknowledge hillwalking is a sport with a risk of personal injury and accept the points made here.
The software is provided as is without warranty on its content and its operation. By downloading it, you acknowledge and agree that : users use the software at their own risk for any bad event (including without limitation: injury, death, loss of data, hardware damage, loss of time...). Authors cannot be held responsible for any bad event in users life.

The software includes some open and free data with their own licence. To summarize, the software is for a private usage, it cannot be sold and users are not allowed to make money with it.

OpenStreetMap license
Condition of use for MountainViews materials
Emerald Island GPS Map is licensed under Creative Commons
Creative Commons License

Installation & use

Useful softwares

These software may help you to display maps, to prepare your route and to manage your date to and from your GPS device.


The Emerald Island GPS Map is provided as Garmin files gmapi on MacOS and as an installer for Windows.

Install BaseCamp (display installed maps) MapManager (install maps on MacOS) & MapInstall (install selected maps on Garmin GPS devices).

Launch Emerald-Island-GPS-Map application to create map installation files (gmap files) on your desktop, double click on a gmap file to install it with MapManager.

Launch MapInstall, choose a tiles set with the combo box, select the tiles you want to upload with the drag box on the overview map. Repeat this for each tiles set you need. Once all wanted tiles are selected, upload them.

Windows OS
Install BaseCamp (display installed maps) & MapInstall (install selected maps on Garmin devices).

The easy way :
Install Emerald Island GPS Map with its installer program.

The alternative way (and probably useless) :
Launch the Mac application, copy the files from your desktop to your Windows computer.
Use Extra option in JavaWa GMTK toolbar to import "*.gmapi" in BaseCamp.

Launch MapInstall, choose a tiles set with the combo box, select the tiles you want to upload with the drag box on the overview map. Repeat this for each tiles set you need. Once all wanted tiles are selected, upload them.

(No file provided)

Install QLandkarteGT (compile selected maps into a gmapsupp.img).
Install QMapShak (edit GPS data)

Copy the directory where Emerald Island GPS Map files are installed on a Windows system or in Wine directory (installer for Windows OS works with Wine on Linux).

In QLandkateGT select the tiles you want to upload on your Garmin device (Map/Select Sub Map).
In the sub window "Selected Maps", click on the summary to enable the button "Export Map", then click it to create and save the gmapsupp.img file.

QMapShack is not yet able to upload maps on GPS devices.
QMapShack is able to display the content of a gmapsupp.img.
It is wise to use QMapShack to everything else except uploading maps on Garmin devices.

Maps storage scheme

A Garmin device can store data in two places : Maps shall be stored in a /Garmin directory available in both storages, whereas the GPS software shall be in internal memory.

Preinstalled maps are usually named gmapprom*.img. They are stored in internal memory and they should not be renamed (for performance and display issue).

A supplemental map, i.e. a custom map uploaded by the user, is named by default "gmapsupp.img". It can be stored in either internal or external memory and can be renamed as you want (avoid long name, space, special and accentuated characters if you don't want to experiment any unknown issue).

A same name can be used both in internal and external memories.

Among all data contains in /Garmin directory, here can be found :
The support of all these files depends on Garmin GPS model.

Upload on a USB device

You can upload selected tiles on any USB mass storage, not only a Garmin GPS device. The data will be stored by default in /Garmin.

  1. If you are unsure of what you are doing, make at least a copy of all the content of your GPS internal memory (it may take a long time).
  2. Any previous map set with the same ".img" file name will be replaced by the new one you decided to upload on your USB mass storage.
  3. It is up to you to rename the existing file on your GPS to avoid an unwanted deletion.

In BaseCamp, you can display only one tileset (a map) at a time.

Emerald Island GPS Map is organized as a set of layers. Each layer is a map with a priority display level.
On a Garmin device, you can display more than one map covering the same area, according to their priority display.

For Emerald Islanf GPS Map :
MapInstaller and QLandkarteGT allow to select tiles from more than one map. All selected tiles set will be merged in a unique gmapsupp.img file that you can rename but with ".img" file extension.

Final words
The map's rendering depends on a TYP style file, like a CSS file for HTML content. Any unprotected map can be customized.

Some rights reserved
Except where otherwise noted, content on this site is licensed
under a Creative Commons Attribution - Noncommercial - No Derivative Works 3.0 License.