Probably it is one of the first versions near 1.14-1.16. Why?
1) I have only software 1.16.00 with the same version of GTT (text of menu). All versions above have higher versions. So there is no support for Arabic that was introduced in 1.18.00 for example.
2) Yes of course there is no marine mode (1.23.00)
3) And so on and etc if I analyze an official changelog. All bugs fixes and improvements are absent in this version of the application.
So it is a very earlier version of the application and it does not higher than 1.16.00!
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