Yes that's fine....another of the five 'button things' seems to be a kind-of linear compass.
I, probably like many walking folks, went for the Memory Maps on the PC many years ago. You appear to be stuck with the version downloaded to your PC at the time of asking whereas with the OS on screen subscription you get the updated annually maps? however the MM system allows for the position of the curser to give a read out of the precise ten digit map ref along with the 100kl alphas.
I am using both for my maps on screen stuff.:-)
….should have said that the OS maps are much clearer than the MM ones on screen.