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Thanks for the advice . Found it not directly in the manual . Had years the first edition TomTom Rider but it started to fail because of failing with power outlet points . And the holder was not the best kind if you road on bumpy roads. Several times it fell out of his holder and to the ground . Never at High speeds but it didn't do some good to the TomTom. SO had to upgrade , I hope the new holders are better . Have to install it one of these day's if I find the time. Thanks again.
DougLap
Posts: 8,248 
Answers
Superuser
Micro SD Class 10 card size 16gb or maximum 32gb. Suggest Sandisk, Samsung or similar major brand.
Doug