Anything to do with aeroplanes, not cheap! C182Q
£2300 to Garmin UK to upgrade the internal hardware/software, quite a big mod apparently, new faster processor etc.
Then about another £2000 for avionics shop.
New GPS aerial and cable to G430 box.No new holes to cut as all new upgrade parts fit into present positions in aircraft. And nice new thick Garmin manual to teach you how to use it!
Includes a 'royalty' fee to GAMA Avionics for their time, expertise and paperwork for the mod in UK.
All done expeditiously and efficiently by RGV Glos.