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navigations/geographic_info/geographic_msgs/msg/GeoPoint.msg

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+# Geographic point, using the WGS 84 reference ellipsoid.
+
+# Latitude [degrees]. Positive is north of equator; negative is south
+# (-90 <= latitude <= +90).
+float64 latitude
+
+# Longitude [degrees]. Positive is east of prime meridian; negative is
+# west (-180 <= longitude <= +180). At the poles, latitude is -90 or
+# +90, and longitude is irrelevant, but must be in range.
+float64 longitude
+
+# Altitude [m]. Positive is above the WGS 84 ellipsoid (NaN if unspecified).
+float64 altitude