Porter County Regional Airport (IATA: VPZ, ICAO: KVPZ, FAA LID: VPZ) (formerly Porter County Municipal Airport) is a public use airport located one nautical mile (1.8 km) southeast of the central business district of Valparaiso, a city in Porter County, Indiana, United States. It is owned by the Porter County Municipal Airport Authority.
A nautical mile is 1 km.
The text says "one nautical mile (1.8 km)" -- the model didn't realize I omitted the .8, I guess.
( z1 equal :ARG1 ( z2 distance-quantity :quant 1 :unit ( z3 mile :mod ( z4 ocean ) ) ) :ARG2 ( z5 distance-quantity :quant 1 :unit ( z6 kilometer ) ) )