Google Earth PRO supports GeoTIFF files. GeoTIFF files are images with all the georeferencing coordinate info built in.
1. Download Google Earth Pro from
here. It's free now. When installing, licence key/password is any email, and 'GEPFREE'.
2. Go to
https://data.linz.govt.nz/ and create a login.
3. Go to
https://data.linz.govt.nz/layer/767-nz-topo50-maps/, and click on the orange/yellow '+' sign in the top left to add it to the map. Use the crop and download buttons in the top right to dowload your area of interest. Select TIFF as the download format.
4. Unzip the resulting file into a folder with a bunch of files.
5. Open Google Earth Pro and use File/Open to open the 'nz-topo50-maps.tif' file. Google Earth Pro will zoom to that area, and you'll see the topomap overlaid. If you get a pop-up appear about cropping or scaling or super-overlay, just choose one. I chose Super-overlay, and it worked fine.
6. Add your GPX file(s) to Google Earth the normal way.
7. Send 7.62x39 SP ammo my way so I can get more goats
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