Jump to content

Recommended Posts

I have been looking for a small and light GPS receiver for an ultra small UAV. Does anyone have any experience with this one. http://www.fortuna.com.tw/U2.htm

It claims to weigh only 7 grams which is hard to believe. They are being sold on Ebay by someone in the UK.

Any other suggestions for light weight and low power GPS would be appreciated.

Jeff

Share this post


Link to post
Share on other sites

Wow that's impressive.

It is only a matter of time before Garmin is able to sell us a GPS unit complete with user interface in a very small package.

The advantage of units like the Garmin is that waypoints can be programmed, allowing us to use the unit for a failsafe come-home feature.

Bill

Share this post


Link to post
Share on other sites

Bill,

I agree that it would be easier to have the GPS doing the waypoint calculations. I may be underestimating the difficulty of programming the waypoint calculations, but since this is only a short distance craft, I was planning to use flat earth approximations to simplify the calculations. I wonder how light I could get something like this Garmin Geko by removing the case and display. http://www.garmin.com/products/geko201/

I haven't been keeping up with GPS, but just did a quick read about WAAS on the Garmin site. Ten foot accuracy would be fantastic.

Jeff

Share this post


Link to post
Share on other sites

I have the 'older' etrex and I got mine down to 1.8 ounces with wires (details are in the photo forum of the old board:

(three pictures starting with this one)

http://groups.msn.com/rccam/rccamprojectph...oto&PhotoID=124

I hear the gecko is even smaller, and with WAAS (available I think in version 2?) the resolution is supposed to be outstanding.

Bill

Share this post


Link to post
Share on other sites

I just took the Garmin Geko 301 on a trip to New Mexico,

it has WAAS (I got accuracy down to 3 feet!) a Barometric Altimeter

and MAGNETIC Compass and runs on two AAA batteries for 9 hours.

I was impressed with this unit, very light, it is going on my next UAV!

It uses all the ETREX accessories.

post-8-1064176127_thumb.jpg

Edited by KE4UVQ

Share this post


Link to post
Share on other sites

Wow, the Geko 3 looks great!

Mike, is barometric air pressure presented on the serial port? Is it buried in one of the custom Garmin sentences? Have you pulled the case off?

This unit looks very promising for our tiny UAV's.

Thanks!

Bill

Share this post


Link to post
Share on other sites

Im not sure, I looked through the manual, it has the

standard bit about the output sentence strings, nothing special

about the air pressure, but I wonder about the GPGGA string, if

it would be more accurate on the altitude because it uses the baro.

pressure instead of the GPS altitude, they are switchable.

Havent taken the case off yet..

Mike

Share this post


Link to post
Share on other sites

After looking at the specs on the first unit mentioned in this thread, I am a bit suspicious of that 7 gram weight. Has anyone bought one of these units and weighed it?

I just received some bare evaluation units from a Taiwanese company that tipped the scale at about 32 grams (one ounce).

I'd be bummed if I got stuck with the 'heavy' units :(

Bill

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×