A couple of years ago I reported issues with using my Tomtom in Cyprus. I've just returned from Malta and have experienced similar problems.
Navcore: 7.917 Map Europe IGB West 945.6243
The kit seems to think that Malta drives on the right and gives warning messages to this effect on establishing the route.
The advance information symbols show the direction as counter-clockwise round roundabouts ....although....
the spoken instructions and the live maps are correct showing driving clockwise round roundabouts.
There are some problems finding places largely due to linguistic difficulties eg to get to Sliema, a large conurbation north of the capital Valetta, it's necessary to know that it's stored under its Maltese name of Ta Sliema. Similarly many of the names shown on English language maps need to be prefaced by Il (I think it's a definite article) to allow the Tomtom gazetteer to recognise them.
Despite all the above I would recommend motorists intending to drive in Malta take their satnavs with them as the hard copy maps available locally and the sign posting leave much to be desired.
It is probably worth mentioning that the driving displayed is generally somewhere between aggressive and homicidal and the condition of many of the roads is probably better suited to a moon buggy than an automobile.