Files with tkl file extension can be found as GPS data files from Holux MapShow305 device.
There is one other file type using
the TKL file extension!
.tkl - Takeoff Live PDF working data
TKL file extension - Holux MapShow305 track
What is tkl file? How to open tkl files?
File type specification:
The tkl file extension is related to the Holux MapShow305.
The tkl file contains tracks for Holux GM-305 personal navigator.
Seems to be obsolete file format without support from developer.
This tkl file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.