Well you could always step back down to a unit for hiking, they do not have voice but will let you navigate back the way you came!
Or turn by turn since they are designed find a straight path to a fro, But at least worse case as it is with what you have it is a mobile electronic map!
you can set way points and corridors, so I guess a person could load a corridor so many miles wide that would keep you intended destination and routes in view.
I am a novice as far as these GPS units are so just toying around with a lowrance i finder expedition, it seems to work fine, load maps on up to a 1 gb card and is capible of playing mp3's. 16 channel. Base Pro shop lets you try them for 90 days so I have 75 days to ensure it is correct for me, then since they hae numerous other units, I can exchange and or just retunr no questions asked. To me that is the best way to test to make sure something will work the way you want with out those restocking fees.
I have only had it a week so far it is nice, from .02-4000 mile view which is from screen side to screen side. it is a little small, but i figure I have already decided where I want to go and this is just so I can reroute or if I see something of interest I can find my way back to where I took a detour.
It does not have a big screen, but if i like it I will step up to a bigger size they are water proof, and do not have a touch or 3d, but the space ship reminds me of Astroids, I have not decided if a bigger unit is neccessary yet.