Thank you! I exported the coordinates to this website: https://www.darrinward.com/lat-long/ You'll have to manually separate the logged data to the format that matches theirs. You could write a simple script in Excel.Alternatively, there might be a CSV to KML converter somewhere that will allow the logged data to be displayed on Google Earth.
Looking at the product page, the Feather uses a Bluetooth LE module which would be incompatible with most ELM327 modules.The ELM327 adapters on Ebay are all at around £5 (about USD$7). Don't go for shields, because they are indeed super expensive. Go for the individual components, as they are cheaper.