This is a self-hosted copy of Tripwire. There is no central service: what you enter stays on this server, and the people who run it are the only ones who can read it.
Signing in. EVE SSO gives this server your character's id and name, and nothing else about your EVE account. For characters you link for tracking it also holds a token it uses to ask EVE where that character is; you can revoke any token from your EVE account's third-party applications page, and unlink a character in Settings.
Tracking. While a linked character is tracked, its current system, ship and online state are recorded so the map can follow it and mark jumps. Tracking is off until you turn it on, per character.
The map. Signatures, connections, notes and flares you add are shared with everyone on the same mask and kept until they expire or someone deletes them. A history of signature changes feeds the statistics panel.
Your account. Display preferences are stored with your account, and a record of each sign-in (time and address) is kept.
Third parties. No email address is collected. This installation sends no usage data to any analytics service. Map data comes from EVE's public ESI API; links to zKillboard, Dotlan and Anoikis leave this site.
Questions. Ask firmware.