Issue with truck speeds

Hi, im using a go 730 and im using the navcore 9.702 and using the TomTom Europe TRUCK 1045.10024 Collection but the truck speeds seem to say 70 on the motorway and 60 etc on dual carridgeways even though i have truck selected is this due to the map or the navcore why its showing me the wrong max speed? bridge heights etc seem to be working ok and have my speed set to 56

Thanks

In my experience the truck navcores and maps do not show the max speed for trucks only the actual speed for that section of road, I think they expect you to know them. When you set your speed in the settings ie 56 mph it only allows them to calculate journey times based on your max speed.