Thank you very much for this example! The GeoMarker result is incorrect. We'll fix that.

Jose.

Hi Jose,

On my system (version 11.0.0 on Windows 7 x64) GeoPosition and GeoMarker do produce different results:

GeoDistance[#[{77., -65.}], #[{-34., -58.}]] & /@ {GeoPosition, GeoMarker}

{Quantity[12323.4, "Kilometers"], Quantity[5189.68, "Kilometers"]}

Best to use the tools at the top of the input area to paste code into a code area...

Of course your code cannot be tested with out the external file you are using...

But to your question, simply use an If statement that tests whether the GeoDistance computation returns

$Failed

as it was for some of your computations. If it returns $Failed then the If statement should try again. If that returns

$Failed

then you can substitute some default value. This is for trying only one extra time. If you want to try n>1 additional times then use another construct such as a While statement or a Do loop that only tries n time.

My code is quite simple, that's why I didn't pasted it. But here it is in case it helps

data = Import["latlong.csv"];

casarosada = GeoMarker[{-34.608116, -58.370380}];

distanciaacasarosada1 = Table[{i, data[[i]][[2]], data[[i]][[1]], QuantityMagnitude[ GeoDistance[GeoMarker[{data[[i]][[2]], data[[i]][[1]]}], casarosada, UnitSystem -> "Metric"]], data[[i]][[9]]}, {i, 2, Length[data]}];