I'm glad I found this forum. I have a website (www.trailmeister.com
)that does exactly what QtrHorse mentioned. Presently the horse trails are confined to Ohio (just waiting on better weather to hit the trails in our new Seattle home!). Besides bridle paths I've got hiking and mountain biking trails mapped in five states.
To keep accurate data I use a survey unit from Trimble. It's accurate to under a meter.
Thanks so much for the opportunity to share!