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TBT is great and helps stop you going miles off course since it beeps at turns and beeps when you're off course.
Sometimes, when I'm low on battery power or whatever I might turn off TBT and you can enable Always Show on the track itself and just follow a line. You don't get told you've gone off course and you don't get told to turn but it only takes a glance now and then to follow.
If you want someone to give you a run down of Garmin 800s I've fucked them up in almost every way possible and can show you how not to.
Depending on when you're going I could loan you some GPS kit and I have some Garmin external batteries I don't often use if you're doing longer rides?
Wow - more good info. Thank you so much.
I think I'll be going for a pair of 800s. I'll copy the route files over one by one and check that they're all in. I can't really afford to go wrong so turn by turn would be quite nice... but I don't want to increase the probability of crashing. Maybe I need to practice having a route but turn by turn off - I presume you just follow the coloured line?
Will think about backing up to prevent losing the files.
@hippy - that's the plan :)