Just bought a cheapo satnav ( https://www.ebay.co.uk/itm/273123051554?ViewItem=&item=273123051554 ) to replace my previous backup option (Nexus 7 currently my main platform).  SkyDemon seems to have loaded on to it fine, (from SkyDemon plan v 3.9.4.0 running on a PC), but when attempting to start it, absolutely nothing happens.  Everything else works fine on it.  Am I missing something?  Set-up seems the same as my previous satnav, which worked well (and now I've worked out that the SD card was faulty, still works - so I didn't need the replacement! :-| )