When debugging GNSS, RTK, or positioning data, parse the NMEA sentence type, fields, coordinate direction, and XOR checksum first, then inspect NTRIP Source-Table or STR fields, and finally verify latitude/longitude order, decimal/DMS formats, and Geohash coverage. Chakan only performs local text and coordinate calculations; it does not connect to receivers, maps, geocoders, NTRIP casters, or account credentials, and it does not prove that a device, base station, or mountpoint is online.
GNSS / NMEA / NTRIP / coordinate lookup
NMEA, GNSS, NTRIP, and coordinate diagnostics tools
A local diagnostic path for NMEA sentence parsing, NMEA checksums, NTRIP Source-Table review, STR line generation, coordinate order checks, coordinate format conversion, and Geohash encoding.
NMEA parserNMEA GGA checksum verificationNMEA checksum calculatorGNSS sentence diagnosticsGNSS fix quality explanationNTRIP Source-Table parserNTRIP Source-Table STR lineNTRIP STR line generatorcoordinate order checkerGeohash encoder decoder
Common lookup scenarios
Parse GGA, RMC, and similar NMEA sentence fields
Verify or generate NMEA XOR checksums
Review NTRIP Source-Table and STR line fields
Catch reversed latitude and longitude order
Convert decimal degrees, DMS, and Geohash values
Recommended workflow
- Paste a synthetic or public-example NMEA sentence and parse its fields
- Verify the hexadecimal value after the asterisk with the checksum tool
- Inspect Source-Table and STR line structure with the NTRIP tools
- Check coordinate order, coordinate format, and Geohash encoding
- Use synthetic examples in public URLs; keep real device locations, accounts, and caster hosts private
Related tool entries
A local diagnostic path for NMEA sentence parsing, NMEA checksums, NTRIP Source-Table review, STR line generation, coordinate order checks, coordinate format conversion, and Geohash encoding.
NMEA-0183 sentence parser
Parse common NMEA-0183 GNSS sentences, checksum status, coordinates, fix quality, speed, and satellite fields.
LookupToolChakanNMEA checksum calculator
Calculate and verify the XOR checksum for NMEA-0183 sentences and generate a standard sentence.
LookupToolChakanNTRIP Source-Table parser
Parse NTRIP Source-Table STR, CAS, and NET lines for mountpoints, RTCM format, coordinates, authentication, and fee fields.
LookupToolChakanNTRIP STR line generator
Generate a copyable NTRIP Source-Table STR line from mountpoint, RTCM, coordinate, authentication, and fee parameters.
LookupToolChakanCoordinate axis order swapper
Swap coordinate axis order in batches for lat/lon, lon/lat, and x/y table cleanup.
LookupToolChakanDecimal degrees and DMS converter
Convert latitude and longitude between decimal degrees and DMS text with N/S/E/W directions.
LookupToolChakanGeohash encoder and decoder
Encode latitude/longitude to Geohash or decode a Geohash into its center point and bounding box.
LookupToolChakanFAQ
When debugging GNSS, RTK, or positioning data, parse the NMEA sentence type, fields, coordinate direction, and XOR checksum first, then inspect NTRIP Source-Table or STR fields, and finally verify latitude/longitude order, decimal/DMS formats, and Geohash coverage. Chakan only performs local text and coordinate calculations; it does not connect to receivers, maps, geocoders, NTRIP casters, or account credentials, and it does not prove that a device, base station, or mountpoint is online.
Does a bad NMEA checksum mean the receiver is broken?
No. Missing fields, copying the wrong checksum range, line breaks, or stray characters can all break a checksum. Validate the text range first.
Can Source-Table parsing prove that a mountpoint is online?
No. It reviews text structure only. Real online state, permission, datum, and correction quality must be checked with receiver or caster-side data.
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