SPAWAR LWPC Longwave Propagation Code v.2.1 was described, validated, and used by numerous authors. Here we present a Python interface to the original Fortran code.

Minimum edits to source to compile on modern (non-Watcom) Fortran compilers such as Gfortan.

cd LWPCv21/build

cmake ..
cmake --build .

./lwpc

the file ../output/lwpm.lwf is created with the simulation output, the console says "Normal run complete" and stderr is 0.

Several example inputs are provided:

./lwpc ../gcpath

./lwpc ../lwpm

./lwpc ../jammer

./lwpc ../bearings

./lwpc ../lwflds

./scan

../output lwpc.lwf

will create text file "scan.log" that will help confirm the simulation was run correctly.