You can buy a touchscreen kit to go on the CID this can then plug into certain GPS box's via a cable then from the gps to the input of the CID (with interface board too)
The video interface about £135 ish, the touchscreen kit from ebay is quite cheap at 15 euros, not sure if thats correct but what i was told. Lastly you would need a GPS Module (for the nav ofcourse)
Have this set including touch at home ready to build it in. But no time . You can get the touchscreen from the seller so no need to buy a touch from elsewhere.
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