Yes there is a way, I have done that to my APM2s. I wanted to leave the Doughter board in place for the Mag and disable the MTK. I found it was easy to cut a GPS TX trace on the board and that would disable that GPS so I could plug in a remote GPS to the port on the main board. This mod is prety easy and if you want to go back to the original you just solder a bridge on the trace. I dont have the unit with me at the moment but when I get home I will take a pic of my mod and you can see if it is somthing you would like to do.
Any chance you'll post a pic to show which trace to cut? Thanks.
Cutting on your board? That doesn't sound like a good idea.
Why not just ask the dev team? Sounds like about 3 minutes of coding to me if it's not already implemented. I'm sure they'd do that for even a couple users rather than have you cutting on the hardware.
I guess that could be a problem. I don't recall any NMEA commands to turn off the GPS off the top of my head either.
Looking at the schematics... I guess I don't understand where the external GPS would plug in. The daughterboard takes up all the pins with either the internal or external option, so it has to plug into some other header pins. There's three serial ports on the unit, so unless you need all three it would be easy to plug your external GPS into one of the others.
The atmega chip has onboard usb. So it's not using one for USB.
For now, I'd suggest clipping the two pins between board and module rather than cutting traces on the board. It's really easy to solder in a new header pin for most people, but potentially impossible for them to repair a cut trace.
Looking top down on everything the pins would be the top row, right-most two pins.
As an alternative, if anyone wants the GPS removed from their board I'd be more than happy to do it in exchange for the GPS module. I'd pay return shipping and I do have a unit on order that I'd trade if I screwed up (I've done plenty of PCB rework).
I have two APM2 from preorder and I need my GPS away from the APM2.
Could you please post a pict / drawing to make sure I cut the right pins.
Or maybe Chris has a solution for preorders meanwhile.
i found this comment back in the presentation post,
Comment by Chris Anderson on December 1, 2011 at 12:16am
Martin: yes, you can either order the version without the GPS on the daughterboard and use an external one, or use the standard board and solder a jumper on the bottom of the board and disable the built-in GPS so you can use an external GPS instead.
but never found which jumber and were.. iam realy desperate cause my internal GPS stoped working..
Please post a picture