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  29.920  0.692  38.282
worldmap 18.728  0.664  25.823