Even with the manual, you may encounter errors. Here is a quick reference table derived directly from the manual's "Error Messages" appendix:

If you manage to download the manual, you will find it is more than just a "how-to" guide; it is a textbook on computational surveying. Below are the core sections you should familiarize yourself with once you have the PDF in hand.

These communities have scanned archives of legacy manuals. Search the "Vintage Software" or "COGO" subforums. Members often share PDFs via Dropbox or Google Drive links. Pro tip: Ask politely and offer to contribute another manual in return.