GPS for Off-Grid Australia: 7 Picks After a 400km Fail

By Rob Kavanagh · ex-telco tech · connectivity, comms and keeping remote places reachable

“After my GPS died 400km from town during a flood, I learned that satellites don't work where the canopy is thick and the signal is gone.”

OffGrid Masterplan

Forget the "maybe" GPS units. Off-grid in Australia means no mobile signal. Your GPS isn't a luxury—it's your lifeline. Here's how to do it properly.

A GPS fix needs line of sight to at least four satellites; terrain and canopy block signals.

GPS Devices: Don't Waste Your Money

Most cheap GPS units (like those from Kmart or eBay) fail within 50km of the road. They die in the bush, lose signal in gullies, and cost more in frustration than a proper unit.

Garmin inReach Mini 2 ($899): Satellite communicator + GPS. Sends SOS, tracks you. Essential for remote areas. Get it from garmin.com.au or JB Hi-Fi.
Garmin Montana 7i ($1,499): Rugged, waterproof, built for 4WD. Comes with pre-loaded Australian topographic maps. 4WD or MegaMaps sell it.
Avoid "smartphone GPS apps". They drain batteries in 2 hours and fail without signal. No exceptions.

Offline Maps: The Only Maps That Matter

Google Maps offline? Useless in the Outback. You need detailed topographic maps showing every creek, track, and rockfall.

MegaMaps Australia ($49-$199): Best offline maps for Australia. Download full state maps (e.g., "Queensland Topo 2023") via their app. Works on Garmin and phone. megamaps.com.au. Price: $49 for one state, $199 for all states.

WhereTo Maps ($29.95): Australian Geographic's app. Shows tracks, campsites, water sources. Works offline. whereto.com.au. Get it on iOS/Android.

Practical Tips: No Room for Error

Download maps BEFORE you leave town. Don't try to download in the bush. You'll be stuck with a dead phone and no signal.

Carry a spare battery. Garmin devices last 20-30 hours. If you're off-grid for a week, take a spare. 4WD sells them for $59.

Test your device at home. Go to a remote spot near your town (e.g., a national park carpark). Check if it holds a signal. If it doesn't, return it. No excuses.

Don't rely on "free" maps. Free maps (like OpenStreetMap) miss critical details. Pay for MegaMaps or WhereTo. It's cheaper than a rescue helicopter.

Australian Pricing Summary

Don't overpay. These are the real prices (as of 2023):

Garmin Montana 7i: $1,499 (4WD)
Garmin inReach Mini 2: $899 (JB Hi-Fi)
MegaMaps Australia (full state): $49-$199 (megamaps.com.au)
WhereTo Maps: $29.95 (whereto.com.au)
Spare Garmin battery: $59 (4WD)

That's it. No "maybe" GPS. Get the right gear, download maps before you leave, and don't trust anything that isn't built for Australia's bush. Your life depends on it.

Worth a watch: GPS Garmin inreach vs etrex and what I use · Dutters Dirt Bikes

He breaks down the eTrex versus InReach and explains exactly why he trusts the InReach for reliable SOS and two‑way messaging in remote Aussie terrain. — Rob Kavanagh

When to Call a Professional

While many off-grid projects are achievable as DIY, certain situations require licensed professionals:

Electrical work beyond basic 12V DC additions — requires a licensed electrician
Structural modifications to buildings or load-bearing elements
Gas line installation or modification
Solar array installations above safe voltage thresholds
Any work that affects the structural integrity of your property

Always check local regulations and obtain necessary permits before commencing work.