FAQ: Does ESRI support the NTX file format?
Does ESRI support the NTX file format?
NTX, a file format created by a software package called CARIS, is not supported by ESRI. NTX files are used mainly with applications dealing with marine navigation.
To use files created by CARIS, export the data to a format that is usable by ESRI.
There are sources on the Web that have NTX converters available for download; see the link in Related Information for one such source.