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Initially everything was fine: the GMAX-EOS talked to the Canon EOS-70D via its hot-shoe and shots were properly stamped with full GPS information, including direction.
There were certain things in the instructions which simply did not work.
The above list could go on: testing every feature is quite a labour! The point is that the GMAX-EOS and the instructions do not agree with each other. However, even considering this, the instructions are not at all bad, especially considering their Chinese origin. But the device deserves good instructions.
Solmeta did release an upgrade to the software but as I do not use Windows and the program for upgrading (supplied by STMicroelectronics) only works on Windows this was no help. Upgrading the software, provide you use Windows, appears to be simple enough using STM's own programming software, available from Solmeta's www site.
The log files are in NMEA format. The computer system I use - RISC OS - has a very good mapping program - RiscOSM - which, at that time, was relatively new and did not at accept these log files. So I suggested to Solmeta that a proper description of the format of the log files should be made available. Surely someone in their organisation had that? - Again no response!
However between myself and the mapping program's author (with help from the internet) we worked out the format and the program's author altered the program to accept NMEA format logs. I wrote up the Solmeta log file format for my www site.
However this does demonstrate that their support is, by modern standards, good. With many products it is simply impossible to get manufacturer's support. Solmeta are good - especially considering that there is probably only one English speaker there, who is not an engineer and is not always available. Translating a chinese speaking engineer's comments so that an English speaking customer can understand is not easy! However Solmeta are quite capable of ignoring questions they do not wish to answer!
Solmeta supply a form to fill in: on this I said Does not connect via hot shoe. Connection via cable is erratic (~50%) and I added Display may be failing: at switch on centre top of display is feint.
It takes a few days to get through Chinese customs (they prefer to export rather than import!) but once Solmeta received it it wasn't long before they returned it. The display had been replaced, but there was absolutely no change in the connection problem.
There was no paperwork in the return, so no engineer's report. I therefore had no idea what tests had been done. Admittedly there are significant problems in arranging a Chinese-speaking engineer to convey useful details to an English customer, but if no fault can be found then surely they should say so.
More emails. Solmeta suspected a faulty cable, but as this would not affect hot shoe connection, I did not think this was the trouble so they sent a replacement. This malfunctioned exactly as did the original.
I therefore took the camera, GMAX-EOS and all to a camera repair expert (Advanced Camera Services of Watton) who tested the GMAX-EOS on my EOS-70D and also on an EOS-7D. The device behaved the same on both.
There are, on the internet, reports from other people with problems of non-communication between GMAX-EOS and camera so it seems this is a tricky area - one which possibly may have been solved with the GMAX-EOS2.
Eventually Solmeta kindly suggested I should return camera and both devices to them for attention. The story of Solmeta's service department is another page.