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thence along said river +/- 800 feet…or something similar. Obviously, you can't enter this as a survey pair, so you have to stop the survey there and start a new survey file after the interruption. Sometimes, if the survey starts and ends at the same point but has an interruption in the middle, you can cut the second half of the survey and paste it before the first half, so the survey starts after the part along the river (etc.) and ends where it first hits the river.
If while entering a survey, you find that you need to enter a pair 'backwards' (in the opposite direction that the survey was intended to go), you can do this by switching 'n' and 's' and switching 'e' and 'w' (i.e. n56-20-30w becomes s56-20-30e). Be especially careful when doing this--it is one of the most common places that mistakes are made.
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