The web, maps and trip check-ins at one bar of signal
1bar is a web app for hiking and camping where cell service is weak or gone. It makes web pages small enough to load on one bar, keeps maps and a field guide on your phone, and keeps the people who’d worry about you posted while you’re out — and alerts them if you’re not back when you said.
Free, with no ads. Run by David Cahill in Lake Stevens, Washington. Accounts are set up on request — ask for one.


What 1bar does
Browse at one bar
Pages load on 1bar’s server; your phone gets a much smaller copy — the text, pictures sized for your screen, video at low data. Slow, dropped connections pick up where they left off.
Maps and a field guide, offline
Before you go, download topographic maps of the area, the forecast and alerts, and a field guide, so they work with no signal at all.
Trip plans
Where you’re going, the stops along the way and when you’ll be back. Check in with one tap — or by text message when there’s no data.
Your people stay posted
Contacts you choose hear when you head out, your check-ins and when you’re back safe, each with a link to a map of the trip.
How trip alerts work
- You leave a plan with a return time and choose your emergency contacts — usually close family and friends.
- Each contact with a mobile number gets one text asking them to reply YES. Nobody gets texts without replying YES, and nothing else is sent unless they do. (Contacts can also get email, with a link to stop in each one.)
- During the trip they get the updates you turned on — usually a few a day, held overnight during your quiet hours (alerts never wait).
- If you’re not back by your time, or you ask for help in the app, they’re told — with your plan and where your phone last was — and told again when you’re back.
1bar is not an emergency service. In an emergency call or text 911, and carry a satellite messenger or beacon where there’s no service.
Text messages
The 1bar trip updates & safety alerts program sends texts from (855) 573-8556 only to travellers who turn on text reminders and to the contacts they add, after each replies YES. No marketing, ever. Message frequency varies; message and data rates may apply. Reply STOP to opt out and HELP for help. Details, and a picture of how people opt in: text alerts.
Who runs 1bar
1bar is run by David Cahill, an individual (sole proprietor) in Lake Stevens, Washington. Contact: david.cahill@gmail.com.
It started as a way to keep using the web on camping trips in the Pacific Northwest, where one bar of signal is often all there is, and grew into a way for travellers to keep family and friends posted. Questions, or want an account? Email david.cahill@gmail.com.