# 4g gps for rocketry?

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#### Motocrossman24

##### Well-Known Member
hey guys, I’m curious if anyone has any experience using 4g “dog/vehicle” gps trackers for rocketry? I remember seeing someone have a link to an older 3g model in a 54mm minimum diameter rocket video on YouTube. The ones I’m speaking of use a SIM card and a monthly data plan and operate over cell networks, broadcasting to an app on your phone. I’m building a 54mm minimum diameter it at the moment, and would really like the added security of a gps, over a standard 70cm tracker. And am hoping to avoid the high price tags of the gps/70cm based trackers designed specifically designed for rocketry. At both local fields, I have decent cell service, one of them much better then the other.

#### Cameron Anderson

##### Well-Known Member
I've seen dog collar set ups that worked fine but never done one myself.

I'm a fan of Missileworks T3...tracked my DX3 XL to apogee at 15,000 and had solid lock 3 miles away when it landed in a ditch and lost RF signal.

It doesn't need cell service but depending on your app that you use with it, cell service gives you real map overlaps instead of just a pin to where you're rocket ended up.

#### Motocrossman24

##### Well-Known Member
I've seen dog collar set ups that worked fine but never done one myself.

I'm a fan of Missileworks T3...tracked my DX3 XL to apogee at 15,000 and had solid lock 3 miles away when it landed in a ditch and lost RF signal.

It doesn't need cell service but depending on your app that you use with it, cell service gives you real map overlaps instead of just a pin to where you're rocket ended up.
Thanks for the reply. I’m starting to lean towards the t3 or the Eggfinder system. My only gripe with the t3 is that it has no support for apple phones, which I use. Have you used the t3 with a laptop? Does it work with any windows laptop? I read that it needs a windows pc with an hmi(human machine interface) which I’m not sure what it is, or if my old windows 7 laptop has one.

#### Cameron Anderson

##### Well-Known Member
Thanks for the reply. I’m starting to lean towards the t3 or the Eggfinder system. My only gripe with the t3 is that it has no support for apple phones, which I use. Have you used the t3 with a laptop? Does it work with any windows laptop? I read that it needs a windows pc with an hmi(human machine interface) which I’m not sure what it is, or if my old windows 7 laptop has one.
I haven't used it from a PC but I have talked to people who did...not sure on the hardware or software used.

For the cost, you can't go wrong with the T3. So long as you're not doing 40K shots, it tracks fine.

#### Cameron Anderson

##### Well-Known Member
Thanks for the reply. I’m starting to lean towards the t3 or the Eggfinder system. My only gripe with the t3 is that it has no support for apple phones, which I use. Have you used the t3 with a laptop? Does it work with any windows laptop? I read that it needs a windows pc with an hmi(human machine interface) which I’m not sure what it is, or if my old windows 7 laptop has one.
I haven't used it from a PC but I have talked to people who did...not sure on the hardware or software used.

For the cost, you can't go wrong with the T3. So long as you're not doing 40K shots, it tracks fine.

#### Alex Poorman

##### New Member
I use a PC and it's great. I use Visual-GPS and all I have to do is hook up the t3 to the PC via Bluetooth. When the rocket lands I find the last GPS coordinates then plug into google earth. The HMI is the PC itself.

#### SammyD

##### Well-Known Member
TRF Supporter
I use a 4G Tracker that uses a SIM card, and it's worked flawlessly for 2 years (previously used a 3G unit until AT&T stopped supporting 3G). The unit is a little larger than a Zippo lighter and weighs just a few ounces, so it's compact, weight is negligible, and it's been durable so far. The smallest nosecone I can get it in is a 54mm nosecone, but that works for me since I don't fly my smaller rockets much higher than about 4000', allowing me to be able to see them through the entire flight.

It's simple, inexpensive, and the GPS unit transmits only when "asked" (I have to call the phone number of the account associated with the SIM card). In return, the tracker texts back to me the LAT/LON coordinates of its location along with a link to Google Maps. When I click the link, it drops a pin on the rocket's location in Google Maps, from which I can see distance and direction to walk or drive to the tracker's location.

#### Motocrossman24

Thanks for everyone’s comments...the biggest issue I’m finding currently is to have a 4g tracker that will fit in the 38mm nosecone bay if my 54mm rocket. Most I’m finding are quite a bit larger, I did find one that states it’s 38mm wide, but then found another that looked identical that claims 38.5mm wide. Then when I consider the 25$a month most the 4g tracking companies want, probably wouldn’t take long to pay for the eggfinder or the t3. Hoping to check out some people’s trackers at urrf, I’m sure there will be more then a few there. My buddy just ordered the featherweight gps too, so I can always use that until funds replenish to buy my own good tracker. #### billdz ##### Well-Known Member Why does it have to be 4g? For$30 you can get a 2g tracker and pay just $5 a month for a SpeedTalk SIM. The MD-601 is 45 x 35 x 16 mm, and the K8 is even smaller. #### timbucktoo ##### Well-Known Member Staff member TRF Supporter Global Mod 2G is gone on several carriers & 3G is not far from same. AT&T by end of year. #### Flyfalcons ##### Well-Known Member Thanks for everyone’s comments...the biggest issue I’m finding currently is to have a 4g tracker that will fit in the 38mm nosecone bay if my 54mm rocket. Most I’m finding are quite a bit larger, I did find one that states it’s 38mm wide, but then found another that looked identical that claims 38.5mm wide. Then when I consider the 25$ a month most the 4g tracking companies want, probably wouldn’t take long to pay for the eggfinder or the t3. Hoping to check out some people’s trackers at urrf, I’m sure there will be more then a few there. My buddy just ordered the featherweight gps too, so I can always use that until funds replenish to buy my own good tracker.
If you already have an Android phone, the most cost-effective GPS over the long-term could be the T3 system. Missileworks sells a 3D-printed modular sled that can screw into the eye bolt in a nose cone. I just fitted my T3 to sit inside a Madcow 38mm FWFG nose cone.

#### billdz

##### Well-Known Member
2G is gone on several carriers & 3G is not far from same. AT&T by end of year.

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#### Motocrossman24

Looks nice if you don't mind the $25 a month, but according to Tom's Guide it is 1.57" (39.9mm) wide and thus won't fit in your 38mm tube, see https://www.tomsguide.com/us/spytec-gl300-gps-tracker,review-2936.html. Bummer, I must have misread the width, a friend of mine just bought the featherweight gps tracker, so I’m probably just going to buy a spare tracker and use his ground station, until I can get the funds around to buying the ground station myself #### Rob702Martinez ##### Zip-Tie Oversight Committee TRF Supporter If you already have an Android phone, the most cost-effective GPS over the long-term could be the T3 system. Missileworks sells a 3D-printed modular sled that can screw into the eye bolt in a nose cone. I just fitted my T3 to sit inside a Madcow 38mm FWFG nose cone. View attachment 385217 View attachment 385218 Anymore pictures of how you mount the sled? #### billdz ##### Well-Known Member Updating this 2 year old thread: * The T-Mobile 2G network is still up and the SpeedTalk$5 per month plan is still the best deal for a cellular tracker
* FreedomPop was acquired by Red Pocket and the free cell service is now greatly limited
* I'm still regularly searching eBay for a 4G tracker to use when my faithful $30 MD-601 finally goes. Many listings say "4G GPS Tracker" but read carefully, most are actually 2G or require a hefty subscription ($20 per month or more)