Yammy, does the Tyros have 4 distinct zones[areas] that it can mark..for example the G1000 has two marks, but allows one zoned area...it will also loop as long as you want..And it really works..Just about everyone I know that uses a G1000, never even tried this feature..Possibly your G people are in the same boat..The DisCover 5 has 4 distinct mark points..