@ChrisO , Here’s what I do for an “easy way” to measure GNSS repeatability using SW Maps on iOS:
- Establish a semi permanent place to mount the GNSS. Can be as simple as attaching a Rod to a fence post, etc.
- Store Points in SW Maps over some period of time. You can store single epochs or average 30 seconds, etc…
- Keep adding stored positions to that Project in SW Maps, over days, weeks, etc.
- You can Export the Project anytime to check on the repeatability.
- The Trick is to Export to Spreadsheet AND select UTM as shown below:
If you don’t know your UTM Zone, it’s easy to find with Google.
With UTM added to the Spreadsheet Export, you get X, Y, Z in Meters in addition to Lat/Long/Z and all the Metadata 
On your iPhone, Open the FILES App and navigate to SW Maps/Export Folder
(I create a shortcut for quick access).
Then you can quickly email the Spreadsheet to yourself from the phone.
A few calculations in Excel and you have real results on the actual repeatability of the GNSS/Antenna/Correction Combination over an extended period of time.
Once you gather lots of data for your permanent position, you can notice when HAS E6 produces a 2’ error, but the GNSS thinks/reports it’s within a few inches. The same goes for any correction source.
Long term testing gets easy if you can establish a permanent location within Bluetooth range of your living room, office, etc. Leave the Torch operating outside and you can store points every 5-10 minutes on your phone from your couch while watching TV at night
Or even have the kids do it from a cheap Android Tablet, etc.