I generally have no issues getting to an exact set of coordinates within 5 minutes on a planet or moon, it takes practice. Having said that, I don't disagree with everything said here, if you are given a mission to go to a particular spot you should be able to go there without a lot of faffing around. If a mission says go to xx/yy on moon zz, then there should be a mission marker at those coordinates or some way to put one there. If a mission says go to moon ZZ and find xx, different thing, but if it's a big moon it would be nice to have some hints.
These things need to be appropriate to the mission, any case where you already have coordinates shouldn't involve flying around the planet or moon looking for them. As for not being able to read the numbers, I sympathise, I need to put on stronger glasses and even then I am sometimes getting 5 and 6 confused.