Create Custom Maps for Garmin GPS

Create Custom Maps for Garmin GPS

Contriibutor Extraordinare
Contriibutor Extraordinare
Joined: July 8th, 2007, 1:46 pm

January 26th, 2018, 2:23 am #1

Garmin has released software updates that allow a variety of compatible devices to use custom mapping.
Before creating and transferring custom mapping, ensure the device firmware is up-to-date with Garmin Express.
Map images can be found in several different file types.
Often files can be found in incompatible formats like PDF, BMP, PNG or GIF. You will need to convert these file formats
to the JPEG format before they can be used to create custom maps for your compatible device.

To convert a file to JPEG:

1.Open GIMP
2.Select File
3.Select Open
4.Locate and select the image map file
5.Click Open
6.If importing a PDF file, change resolution to 300 pixels/inch on import page
7.Click Import
8.Click rectangle selection tool (Or press R on keyboard)
9.Draw a box around map
10.Select Image from menu
11.Select Crop to Selection
12.Select File from menu
13.Click Export
14.Type in filename
15.Expand Select File Type (By Extension)
16.Select JPEG image
17.Click Export button
18.Click Advanced Options
19.Uncheck Progressive
20.Click Export button

The file will now be saved in the JPEG format. [Photoshop can also be used to convert to JPEG format]

To create a custom map from a Google Earth Image:

1.Open Google Earth
2.Zoom into approximate area that custom map will cover
3.Draw a ‘border’ around the area using the ‘New Path’ option in the menu. Save this for future reference.

.....Note: If you are prospecting & the map area is of a tenement & you know the boundary co-ordinates it will be helpful making the border
..............the tenement boundary as when the map image is completed then the boundary will be displayed as part of the map.
4.Set image area & save image using resolution 1024 x 768.

........with the border still displayed .[This allows easier line up of the overlay in G.E.] as shown in image below:

5.Open image in Photoshop & crop as necessary leaving the border displayed & save as ‘Save for Web Devices’ [keep image pixel size under 1meg usually 300-450 Kbits]

........NOTE: Ensure you don’t save in progressive jpeg format but as standard format as Garmin devices will not accept progressive format images.

6.Go back to Google Earth

7.Select Add from menu
8.Select Image Overlay
9.Name map file
10.Click Browse
11.Locate and select JPEG map file

12.Click OK

13.The map will need to be resized to match satellite image
o..Adjust transparency bar between 50% and 70% while resizing image

o..Start at one corner and zoom in
o..Position mouse cursor over corner to click and drag corner to approximate correct position & line up the overlay to the border line you made prior to taking the image
...(or focus .on roads, notable objects closest to corner)
o..Move map to opposite corner and reposition
o..Repeat for each corner until the overlay lines up with the border lines on each side.
o..Double check all corners again and adjust as necessary change the Transparency back to 100% Opaque

o..If finished resizing the custom map, select Altitude tab
o..If custom map is wanting to be viewed above all other maps, change Draw Order to 50 or higher
o..If you desire to see the custom map below all other maps, change Draw Order to 49 or lower

o..Click OK [Your overlay is now displayed in your 'Places' window on the left of the Google Earth display.]

14.Locate Places (left of the map...In this case it is in the 'Temporary Places' section)
15.Locate Custom Map (named according to step 4)
16.Right-click on Map Name
17.Select Save Place As...[this will be a kmz file]
18.Save map to either (Garmin device drive) /Garmin/Custom Maps Directory on your computer/ or (microSD card) /Garmin/CustomMaps/
19.Eject and unplug device from computer
20.If necessary, power on device

Your custom mapping will now be viewable on your device when you are in that map area.
If you have Garmin BaseCamp it can be viewed there also.

Compatible devices:
o..Alpha 100
o..Astro 320
o..BMW Motorrad Navigator V
o..Colorado series
o..Dakota series
o..Edge 800/810/1000
o..Etrex 20/30
o..GPSMAP 62 series
o..GPSMAP 64 series
o..GPSMAP 78 series
o..Montana series
o..Oregon series
o..zumo 590
o..Garmin Rino 650

"I believe that if life gives you lemons,you
should make lemonade & try to find somebody
whose life has given them vodka, & have a party"!!!!


Contriibutor Extraordinare
Contriibutor Extraordinare
Joined: April 22nd, 2007, 1:07 pm

April 9th, 2018, 9:29 am #2

Would this exercise be worthwhile for the 2018 meet mapping out where we can and can not detect?

Good luck & safe travels

"Aging seems to be the only available way to live a long life."

Contriibutor Extraordinare
Contriibutor Extraordinare
Joined: July 8th, 2007, 1:46 pm

April 9th, 2018, 10:36 am #3

Hi Peter,

If you want to define a tenement boundary on a map image to display on the Garmin GPS then yes
from what I have of the tenements available there is a possibility of producing a map image file size
to load onto the Garmin but remember the image detail of the total area will be limited because of the
google image detail covering the whole of the lease will be poor unless you divide it up into sections
at a higher resolution. i.e. taken at a lower distance from the surface.
Consequently you will not get the total area of the tenement but only a part of it.
If you are just looking at a particular section of the tenement with part of the boundary displayed then
The tenements I'm looking at apart from one cover a very large area so just for a specific area then it
is possible.
I have sent you a PM.

"I believe that if life gives you lemons,you
should make lemonade & try to find somebody
whose life has given them vodka, & have a party"!!!!