These mapping symbols are available online through the Alexandrian website:

https://thealexandrian.net/?p=51058

Although originally designed for use with the defunct Dundjinni mapping software, these tiles were created by Justin Alexander.

Permission to use these symbols commercially and non-commercially is granted as long as the following notice is used:

Old School Mapping Symbols created by Justin Alexander (https://thealexandrian.net). Used with permission.