Dual band GPS is now much cheaper as L5 chip prices are way down. I still
think they are a bit of a battery hog, but perhaps that has changes. The new
pro iPhone series and watch have the dual freq capacity and should have
accuracy to within cm's theoretically and avoid multipath issues. I would
probably use an app like Strava as it is a piece of cake to get the gpx files.
I now use my watch and I-gotu for looong trips which hasn't happened since
covid.
https://www.guidingtech.com/dual-frequency-gps-explained/
Where is, Mike
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