Module gps 

GPS logs (NMEA 0183, GPX) as a table. Neither scans in place, so an open reads the file once in pieces, writing rows a batch at a time to a temp Arrow IPC file (claimed via the open’s Writer) that the dataset scans lazily. A GPX extension field appearing late starts a new segment file with the wider schema, joined with nulls; NMEA is always one segment. Readers are incremental, so a growing log can be followed later.

Modules

gpx

GPX tracks, routes and waypoints: one row per trkpt, rtept or wpt.

nmea

NMEA 0183 logs: the sentences a GPS receiver writes, one per line.