Nevermind, I found this on the archives, I am going to use this 
    RTCM   GPS 18x LVC      6 GRX <-- Rx Data 6 Green  7 GPPS <-- Pulse
Output 1 Yellow  8 GND   Ground 3 Black  8 GND   Ground 5 Black  13 +5V -->
Vin 2 Red  14 GTX --> TX Data 4 White



On Fri, Dec 18, 2015 at 2:00 PM, Skyler F <electricity440@gmail.com> wrote:
Thanks, Do you think I am right on the everything else, the GRX and the GTX ( does rx connect to tx or does rx connect to rx)

On Fri, Dec 18, 2015 at 1:51 PM, Steven Donegan <donegan@donegan.org> wrote:
The GPPS is likely designed to connect to a GPS Pulse Per Second - which is likely the measured pulse thing...

Caveat - I know nothing about the RTCM, but I do know some about interfacing GPS modules for other purposes.
 
Steven Donegan
KK6IVC General Class FCC License
PP-ASEL
Silver State Car #86
www.sscc.us


From: Skyler F <electricity440@gmail.com>
To: "app_rpt-users@ohnosec.org" <app_rpt-users@ohnosec.org>
Sent: Friday, December 18, 2015 12:47 PM
Subject: [App_rpt-users] Garmin GPS 18 LVC RTCM wiring

I am now going to solder the Garmin 18x GPS to the DB15 connector for the RTCM.

I am a little confused by the labels so is this pinout correct?

RTCM  ---  GPS

GRX  ----- TXD
GPPS ----
GND ------ GND
+5V   ----- Input Voltage
GTX  ----- RCV
RST  -----

Is this correct? There is also a "measurement Pulse Output" wire, but I don't know what to do with that.

Garmin GPS 18 wiring



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--
Skyler Fennell
amsatnet.info
KDØWHB
electricity440@gmail.com