Toyota RAV4 Forums banner

1 - 12 of 12 Posts

·
Registered
Joined
·
548 Posts
Discussion Starter #1 (Edited)
Hello, I have a 2013 LE, so no built-in GPS, but I would like to add a little portable GPS unit that can be put away when not needed.

The feature that I am looking for is for it to operate in a fashion that is similar to dashcams; IE, when the IGN is off the unit turns off, and when the IGN key is on, the unit operates.(although the internal battery will maintain memory settings, etc all of the time).

I have two portable GPS units, but both require a press of the power button to shut down, and I was going to build a circuit that connects across the PWR button and senses IGN status to simulate that function, but if something already exists in the market, then I will give that a whirl instead.

Is there such an animal? Any suggestions and or recommendations welcome.
 

·
Your Humble Administrator
2008 RAV4 Limited V6
Joined
·
16,756 Posts
I have a Tom Tom that my uncle gave me. It turns off when the ignition is turned off and it's plugged into the switched outlet. Still have to turn it on when starting the car again.
 

·
Registered
Joined
·
1,912 Posts
when the IGN is off the unit turns off, and when the IGN key is on, the unit operates.(although the internal battery will maintain memory settings, etc all of the time)..
The settings such as waypoints and config settings are stored on the internal memory or SD card. The internal battery can be completely run down without losing this data.

I have two portable GPS units, but both require a press of the power button to shut down,
My experience with Garmin GPSRs, is that when the 12 volt source is removed the unit is powered off. When the 12 volts is reestablished, the GPSR does a complete reboot and restarts. Basically they do exactly what you are looking for.

Are you saying that when removing the 12 volts from the cigarette/power plug that your GPSR continues to run normally?. What brand are these two units?
 

·
Super Moderator
Joined
·
10,204 Posts
I have a Garmin permanently mounted in my 2001 F-250. It's connected to an ON-IN-RUN circuit so it goes off 10-15 seconds after "external power lost" when I shut off the engine and comes back on when I restart, all w/o me touching it at all. In fact it's voice command responding to my "Hey Garmin" so I never do touch it. Neat.
 
  • Like
Reactions: whipaway

·
Registered
Joined
·
1,912 Posts
I have a Garmin permanently mounted...... when I shut off the engine and comes back on when I restart, all w/o me touching it at all. In fact it's voice command responding to my "Hey Garmin" so I never do touch it. Neat.
I have a Garmin that responds to the "Hey Garmin" command as well ( a 2460 IIRC). I also have an 880 model that responds when you push a button that is attached to the steering wheel, with a rubber strap.

Most units power down completely when the 12 volt power is removed, and then start up again, as if the start button was pushed, when the 12 volts is re-established.

The Garmin 880 had a unique feature, in that only the screen would go off when the 12 volts was removed. It was still running internally, keeping track of the satellite locations. When the 12 volts was re-established the screen would light up, and your position was displayed immediately. The only problem is that the internal battery would only last about 24 hours with the screen off. If the vehicle was not used during this time the internal battery would die, and the unit would need to go through a cold start when the engine was finally started.

As mentioned the internal battery would last about 24 hours with the screen off, but only 5 hours if the screen was on. Much like a cell phones battery life is greatly reduced with a lot of screen time.
 

·
Registered
Joined
·
294 Posts
All three of my Garmin units will shut down & power up when plugged into 12v socket also - if that's what you want it to do. Voice activated and free updates. They have come a long way over the years.
 

·
Registered
Joined
·
548 Posts
Discussion Starter #7
Are you saying that when removing the 12 volts from the cigarette/power plug that your GPSR continues to run normally?. What brand are these two units?
MIO Digiwalker C220

Navigon 2100

Both units stay on after 12V is removed. Both are mid-2000s vintage, probably around 2005-2007, so Yes, GPS units have come a long way since then.
 

·
Super Moderator
Joined
·
10,204 Posts
MIO Digiwalker C220

Navigon 2100

Both units stay on after 12V is removed. Both are mid-2000s vintage, probably around 2005-2007, so Yes, GPS units have come a long way since then.
Seems you have three choices:

1. Turn them off manually and if they don't turn on with 12V, on manually.
2. Take the batteries out. Bet they'll go off then!
3. Mod them until you break them. (I'm thinking of many of my mod attempts. :doh:)
4. Buy an new one. I really like my Garmin both for the voice command and that it flips vertically like a smartphone so I can see what's ahead of not beside my.
 

·
Registered
Joined
·
1,912 Posts
Yes, GPS units have come a long way since then.
A bit of a history lesson for GPS buffs.

My first GPSR was a handheld device I purchased in 1995. Back then the US government implemented a feature called Selective Availability (SA). SA deliberately altered the signal so that civil receivers would not have accuracy better than 100 meters, while military units had normal accuracy with 5 meters.

I understand that in times of conflict, when there were not enough military units to meet the needs, SA was turned off so that military personnel could use civilian units and have the same 5 meter accuracy.

In May 2000, President Clinton ordered that SA be turned off so that everyone could make use of accurate GPSRs. It was only after that, when the GPS system was accurate enough to be used in automobiles (although there were some early attempts when SA was still turned on).

Nowadays surveyors make use of a system called Differential GPS (DGPS). This system makes use of many ground stations. The accuracy of the GPS calculated location varies throughout the day depending upon the geometry of the satellites in the sky. These ground stations check their coordinates from the GPS satellites. and calculate the error from their known exact coordinates. This correction factor is sent to the surveyors units in the same geographic area, allowing accurate measurements to within 1 cm.
 

·
Registered
Joined
·
1,912 Posts
So, the general consensus for a recommended GPS is Garmin?
That would be my recommendation. Make sure you get a model with LMT or at least LM in the model name. These models will cost a few dollars more than the same model without the LM or LMT, but you can get free Lifetime Map Updates about 4 times per year. You will also get free traffic information on the LMT models. The map updates would normally Cost about $75 if you had to pay for them.

Garmin also has a few hands free models, so you can give it a new destination without touching it.
 

·
Super Moderator
Joined
·
10,204 Posts
1 - 12 of 12 Posts
Top