The map in the SH series is not organized in Long/Lat data, but in secretely coded QUADRANTS. For example: AN51 etc.
There is a special map in your tool box that you can chose in the map menu of SH5 to overlay your normal map and show you the different quadrants.
Sorry, but I currently cannot come-up with a screenshot, but find this map and things will get easy soon...
Also I have no idea why the long/lat data is not showing in the picture above, maybe OP has played with and messed-up the OFEV ? If so then one can return it to its default values by running the batch file for it.
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