I found no such function. The manual does not say any thing about it. My GPSMAP 66 can reverse tracks and it is mention in its manual. Reversing a track is one of some functions which I miss in the H1 compared to the 66.
Unfortunately it's currently (firmware version 7.07) not possible to reverse a course on the device itself (note that the H1 doesn't use tracks or routes anymore, just courses or recorded activities).
