Thank you for reply and help!
yes - to work on Debian Buster would be much better - I know.
But with actually dietpi version I get on apt the following answer:
" Reading state information... Done
Package qmapshack is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'qmapshack' has no installation candidate "
Therefore I tried the stretch version of dietpi and got qmapshack with apt - but a very early version 1.7.2 - thats my problem.
Any idea to solve my problem?