Settings for Garmin - Indian Grid System

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Contents

• Incorrect Support for Indian Grid in Garmin Devices

• Settings for Indian Grid

Incorrect Support for Indian Grid in Garmin Devices

Garmin navigation devices do not natively have correct support for Indian Grid.

This is due to no option/support for 'Indian (India & Nepal)' datum. The closest datum is 'Indian (Bangladesh)' datum. However, the latter results in error across all the Zones, in coordinates of 07m on an average, with a maximum of 15m!

Settings for Indian Grid

However, it is possible to setup Garmin navigation devices with certain settings to get more accurate Indian Grid coordinates.

1. Open 'Main Menu'. This involves pressing the 'Page' key till 'Main Menu' is selected:
   
2. In 'Main Menu' open 'Setup', which is generally the first option:
   
3. In 'Setup' menu, scroll to 'Position Format':
   
4. In 'Position Format' menu, there are three sub menus:
   1. Position Format
   2. Map Datum
   3. Map Spheroid
   
5. Open 'Position Format' sub menu and select the last option in the list, 'User Grid':
   
6. Selecting 'User Grid' will open a menu with title 'Grid Projection'. Here select 'Lambert Conic 1 Parallel':
   
7. On selecting 'Lambert Conic 1 Parallel', you will be asked to specify the parameters:
   
   The above shows sample parameters for Zone IIA.
   Specify the parameters as per your zone:

   Zone	False Easting	False Northing	Scale	Longitude Origin	Latitude Origin / Latitude of Parallel One
   0	+02153866.4	+02368292.9	+00.9984615	E068°00'00.00"	N 39°30'00.00"
   IA	+02743196.4	+00914398.8	+00.9987864	E068°00'00.00"	N 32°30'00.00"
   IB	+02743196.4	+00914398.8	+00.9987864	E090°00'00.00"	N 32°30'00.00"
   IIA	+02743196.4	+00914398.8	+00.9987864	E074°00'00.00"	N 26°00'00.00"
   IIB	+02743196.4	+00914398.8	+00.9987864	E090°00'00.00"	N 26°00'00.00"
   IIIA	+02743196.4	+00914398.8	+00.9987864	E080°00'00.00"	N 19°00'00.00"
   IIIB	+02743196.4	+00914398.8	+00.9987864	E100°00'00.00"	N 19°00'00.00"
   IVA	+02743196.4	+00914398.8	+00.9987864	E080°00'00.00"	N 12°00'00.00"
   IVB	+02743196.4	+00914398.8	+00.9987864	E104°00'00.00"	N 12°00'00.00"

8. Press quit to get back to 'Position Format' menu. Next select 'Map Datum'. In this sub menu, select 'User':
   
9. You will be prompted to specify the datum transformation parameters. Enter as show below:
   
10. Press 'Quit' to get back to 'Position Format' menu. Next select the sub menu 'Map Spheroid'. In the next sub menu select 'Everest (Sarawak)':
    
    Note: 'Everest (Sarawak)' is not the same as 'Everest 1956' which should have been used, but it has the closest values to 'Everest 1956'.
11. The 'Position Format' menu should now look like this:
    
12. The device will now show more accurate Indian Grid coordinates:
    
13. With these settings, the coordinates have been tested to be within about 01m of correct values.