Privacy notice
Last updated: 16 October 2026 · Free Drive added
EVNav TH is a personal, non-commercial hobby project — free, as is, with no warranty and no liability. Plans are estimates; always check before you drive.
EVNav TH (evnavth.com) is a personal project: an EV trip planner for Thailand you can use without an account (a free account is optional). This notice explains what personal data we handle, why, and your rights under Thailand's Personal Data Protection Act B.E. 2562 (PDPA).
What we process
| Data | Why | Kept |
|---|---|---|
| Start/destination you enter and your trip settings (car, battery %, preferences) | To calculate your route and charging stops. Processed per request; not linked to you. | Not stored, unless you save the trip |
Saved trips + a random ID cookie (evrp_user) |
Only if you press “Save this trip”: lets this browser find its saved trips again. The ID is random and not linked to your name, email or phone. | Until you delete the trip; cookie expires after ~13 months |
| Optional account: email address or phone number; name and profile picture from Google or LINE if you sign in with them; session and sign-in device details | Only if you sign up or sign in: to keep your saved trips and planner settings (car, battery levels, strategy) on all your devices (contract). If you use the Free Drive page “Chargers ahead” while signed in, the last destination you chose there (a place name and its coordinates, which is location data) is kept too, so the page can offer to continue to it; signed-out visitors keep no destination. On your first sign-in, trips saved in that browser move into your account. | Until you delete your account; deleting it also deletes the trips, settings, share links and last destination in it; the destination is also deleted when you clear it |
| IP address, browser type, time of request (server and CDN logs) | Security, abuse prevention and fixing errors (legitimate interest). | Up to 30 days |
We use no advertising trackers and we do not sell personal data.
Analytics (only with your consent)
If you click Accept analytics, we use Google Analytics 4 to understand how the planner is used:
pages viewed, device and browser type, approximate location (city level) and anonymous usage events such as
“trip planned” (distance, number of stops, car brand) or “opened Google Maps”. We never send your start or
destination, coordinates, email or other identifying details. Google Analytics sets the cookies _ga and
_ga_* and processes the data as our service provider, which may involve transfer outside Thailand.
Data is retained for up to 14 months. If you decline or don't choose, Google Analytics is not loaded at all.
You can change your choice any time via Cookie settings.
Separately, we count page views with Umami, a statistics system we host ourselves, without cookies and
without storing your IP address. It records the page viewed, the referring site, browser, operating system, device,
language and approximate location (city level). The query string (?…) and fragment (#…) of
the address are never stored, and it is not used on shared-trip pages.
Services that see your requests
- Cloudflare (content delivery and security) processes every request to evnavth.com.
- Map files (map data © OpenStreetMap contributors) are served from Cloudflare's storage, which sees your IP address like any web server.
- Google Maps — only when you tap “Open in Google Maps”; from then on Google's own privacy policy applies.
- Google Analytics — only if you accept analytics cookies (see “Analytics”).
- Umami (pulse.moonhutbeach.com, hosted by us) receives cookieless page-view counts (see “Analytics”).
- Clerk (Clerk, Inc., USA) runs accounts and sign-in — only when you press “Sign in”. It processes account data as our processor, in the United States. If you sign in with Google or LINE, that service learns that you signed in to EVNav TH.
The planner and its database (saved trips, settings) run on our server in Singapore, with a copy and backups on our own servers in Thailand; map files are served through Cloudflare's network; account data is held by Clerk in the United States. Where data leaves Thailand, we rely on the safeguards available under the PDPA.
The EVNav iPhone app
- Location — asked for only “While Using the App”, to set the start point of a trip. In driving mode the app follows a trip you started, also with the screen locked. Our server does not track your drive; a position is sent to our server only to plan or replan a trip or to look up nearby chargers or chargers ahead in Free Drive. It is used for that request only (server logs: see the table above), unless it is part of a trip you save.
- CarPlay shows chargers near the car or along your trip.
- Trips saved while signed out stay on the phone until you sign in; then they move into your account (see the account row above).
- No tracking, no ads and no analytics SDK in the app (Google Analytics is used only on the website, and only with your consent). Notifications are scheduled on the phone; there is no server push.
- Delete your account in the app: Settings > Account > Manage account > Delete account.
- Free Drive: while you drive, the app sends your position, direction, speed and, if you set one, your destination to our server about every 5 km to find chargers ahead. This works like the nearby-charger lookup above: the server uses it for that request only. To make battery estimates better, the app also sends anonymous battery data: estimated and entered battery %, speed, distance, time, charging stops (power, minutes, % before and after), the car model, and an area of about 5 km. It does not send your account, a device ID or exact positions. Each drive gets a new random ID, and the first and last kilometre are left out. This is on by default; switch it off in Settings > Free Drive > Share anonymous battery data. The data is kept for up to 2 years for statistics.
Cookies
Strictly necessary: a cookie with a random ID is set only when you save a trip, and Clerk session cookies
(__session, __client_uat and cookies on Clerk's domain) only when you sign in. Optional: Google Analytics
cookies, only if you accept analytics (see above). Deleting your browser cookies removes access to saved trips
and resets your analytics choice.
Your rights
You may ask to access, correct, delete or export your data, object to or restrict its processing, and complain to the Office of the Personal Data Protection Committee (PDPC). Saved trips can be deleted directly in the app, and you can delete your account yourself under profile menu → Manage account. For anything else, email privacy@evnavth.com. Because we do not know who you are, we may ask you to send the request from the browser that saved the trips.
Changes
If we change how data is used, we will update this notice and the date above before the change takes effect.