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No, because it gets the distance wrong if you start half-way around. ie. it says 200k to go when I've only just started it. I'm doing what the others have suggested and stopped using TBT nav and just following a line. Problem is I now need power to show on another device.
Hmm... I've got an etrex Vista HCx I could use for navigation and the 800 could be used for power.
How do you need to move the start? A loop is a loop and Garmin will navigate? My 800 threw some interesting tantrums on Saturday. Who's got an etrex 30 for a few weekends in May?