Found the following significant warnings:
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
  Warning: working directory was changed to ‘/home/hornik/tmp/R.check/r-devel-clang/Work/build/Packages/oceanmap/test_files’, resetting
Examples with CPU or elapsed time > 5s
           user system elapsed
plotmap  27.412  0.748  28.181
worldmap 17.740  0.712  18.503