You can import WMS data into Gaia GPS using QGIS and Mapbox Studio. This article shows you how to import those map sources directly into Gaia GPS.
How to Import ArcGIS WMS Map Sources
First, convert the WMS (GeoJSON) file to a shapefile using QGIS:
In ArcGIS, select the WMS format and then use the Query
feature to export a GeoJSON-
Export as a GeoJSON with these settings using “Query (GET)”:
WHERE: Sub_Zone >0
Geometry Type: Envelope
Out Fields: *
Format: GeoJSON
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Open the GeoJSON in QGIS and export as an ESRI Shapefile
Open the file with QGIS
Save each layer in QGIS as a shapefile by right-clicking on one of the layers and selecting "Save As"
Name the shapefile:
Compress the 5-6 files produced by QGIS (.shp, .qpj, .prj, .dbf, .cpg, & .shx) into a zipped folder.
Then, import the shapefile into Mapbox Studio by following these steps: