I have one you can download routes too, but not the Topo maps as no memory expansion.
This cut down OS map (topo) is expensive, and not sure how useful in reality.
Yes, what I logged at FOD can be downloaded and mapped. Think you can put them in google too now (assuming it had signal in the trees as they are line of sight...)
Easiest way is to plot a route on MM/tacklogs and download. Absolute doddle.