Was this a newly purchased DirectRoute or one you were using in an eXplorist? It's not of much use if it won't street route. That's really the main point.
Street routing is the main point of a hand held? 10 MB is not a lot for detail maps. The Explorist 210 has 22 MB, for heaven's sake! Seems like a step backward.
A handheld is not for street routing. It is primarily for outdoor use. If you want street routing you use a vehicle navigation unit. Like mixing apples and oranges.
Wow! Silly me! I didn't know a handheld "is not for street routing." I've been successfully using my eXplorist 500 with DirectRoute for both street routing and offroad for almost two years now. I like being able to use the same unit for both purposes.
When you loaded the DirectRoute maps to the Triton, did it at least show the line from your present location to the cache on the map screen? At least that way the maps would be somewhat useful (But still not worth purchasing for geocaching purposes.)
edited to add: I have a suction cup mount for the 500 that has held up for as long as I've had the unit. I was concerned when I got it that the screen wouldn't be big enough, but that's not been a problem at all. As for storage of the maps, changing SD cards takes about 20 seconds.
It would do everything but the turn by turn directions.