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Today I have received nuvi 765W from one friend to add POI.
The nuvi has preload map of CN Europe in the internal memory H:\Garmin including :
Gmapbase.img
Gmapbase.sum
Gmapprom.img
Gmapprom.sum
Gmaptz.img
(remaining space on the internal memory is 5.9 MB only).

And additional map of CN Middle East on SD card I:\Garmin including:
Gmapsupp.img
Gmapsupp.gma
Gmapsupp.uni

I want to switch maps between the internal memory and SD card; means I want to move the CN Europe from internal memory (in H:\Garmin) to SD card (in I:\Garmin), and CN Middle east From SD card to internal memory.

Please advice the right way of doing it? While moving the gmapsupp.img of CN Middle east from SD card to internal memory do I need to move gmapsupp.gma&uni too?

Your advice and help is higly appricated.   

In the link below you will find GPS databases for speedcam, & speed limitation selected by countries and categories in .csv & .gps format for Garmin.

www.poiplaza.com/index.php

Anybody has similar or better than this web site, please advice. 

I have my garmin main memory become almost full. I plan to change the name of the preload map (Navigator Europe NT v9 Limited- Deluxe) gmapprom.img (1.35GB) and gmapprom.sum (1 KB) in H:\Garmin\ to gmapsupp.img & gmapsupp.sum. Then after that I will move both files to SD card (I:\Garmin\).

The Idea is that to make extra space in the main memory for the new update for my essential map City Navigator Middle East NT 2011 in H:\Garmin.

1st question do you think it will work out.

2nd After this operation I will have in my SD card I:\Garmin\ gmapsupp.img only (which was originally gmapprom.img in main memory), and gmapprom.sum left in main memory H:\Garmin\.

Now:
1. Shall I leave the gmapprom.sum in the main memory without any change.
2. Shall I change the name of gmapprom.sum in the main memory to gmapsupp.sum and then move it to SD card to make sure that the moved gmapsupp.img (originally gmapprom.img).