As per subject. I am stuck with a tomtom one 250mb sd card. Want to avoid buying a new one so wondering if anyone can help with the is the latest navcore and map that I can fit on that size?

Currently I the following (which is acient)

Navcore: 7.903
map: 715.1689

the above doesn't even support full postcode search which is a hassle

Thanks for your help in advance