Sorry, Garmin has discontinued this product
Be sure to read the Garmin GPS-25 Frequently Asked Questions below.
Read about recommended power supply designs for the GPS-25.
- Garmin GPS-25 (12 channel parallel sensor) engine (1.83" x 2.75" x .45")
- Power/data cable with connector shell and pins
(The connector is a mfg subminiature PCB edge connector with cable attached)
A $12 value.
GPS-25 Technical Specification (pdf, 115K, 35 pages)
- GPS-25 Technical Specification (pdf, 115K, 35 pages)
Please note: This is not an enclosed/sealed unit. It is assumed that the purchasers will be installing the unit in another enclosure for normal and experimental operations. These units will be useful with current APRS software and the TAC-2 (Totally Accurate Clock) kit designed by Tom Clark, W3IWI.
As well as the MIC-E kit for APRS tracking.
All Garmin engines come complete with DGPS input capability (see note below), PPS
timing output and lithium 3V battery on board
The Garmin GPS-25 will simultaneously track up to twelve satellites providing fast time-to-first-fix, one second navigation updates and low power consumption.
Footprint (1.83" x 2.75" x .45")
|Time to first fix|
|reacquisition||< 2 sec|
|sky search||5 min|
|update rate||1 sec continuous|
|102 predefined, 1 user defined|
|input voltage||5.0V DC +- 5% regulated (a suitable regulator should be used)|
|power consumption||220mA typical, 180mA reset, 350mA max.|
|backup||on board 3V lithium (10 year lifetime)|
|antenna||50 ohm MCX female connector for active (5V DC @ 15ma) or passive antenna|
|power/data||single row, right angle 12 pin male|
|configuration||1 integrated board engine|
|size||1.83"W X 2.75"L X 0.45"H|
|op temp||-30 deg C - +85 deg C
(remove Li battery for extended usage above 85 deg C)
|storage temp||-40 deg C - +90 deg C|
|compatibility||2 RS-232 serial ports|
|data rate||User selectable baud rate 1200/2400/4800/9600|
|format||NMEA 0183 v.2.0, ASCII|
|inputs||Initial position, date and time (not required), 2D/3D & earth datum command, RTCM-104 v.2.0 differential|
|outputs||Position, velocity & time, receiver and satellite stautus, geometry and error estimates|
|timing output||Timing output with +- 1 microsecond accuracy|
Sorry, Garmin GPS25LVS is no longer available
Frequently Asked Questions
- The GPS-25 can accept DGPS signals.
- Antenna options (which can be purchased directly from Garmin if required) include:
- mag mount
- flange mount (bolt to a car)
- trunk clip
- suction cup mounted
- The unit has true time clocks, PPS timing, and nonvolatile memory on board.
- The interface is NMEA 0183 (TTL levels) and RS232 (+ and - 15 volts)
- The unit can be powered by AA batteries. Batteries or external supplies will require a suitable power regulator.
- The unit only gives NMEA sentences as output, no extraction of RTCM-104 data.
- There's no problem with the antenna being close to the boards.
All sensitive components are shielded.
- The unit has a LNAs and you can use passive antennas.
You need to keep the antenna runs short however.
- The antenna is attached with a MCX (also know as OCX) connector, which is a friction lock connector.
- There's a header for connecting the data cables.
A connector and cable will be included in the kit.
The connector is a subminiature PCB edge connector.
This is not the same connector as used with many hand-held units.
- You cannot adjust the intervals that the boards outputs data.
However, you can adjust their baud rate.
- The boards do adjust for leap seconds (via the satellites).
- For DGPS, since these are just the boards, you can't use the Garmin DGPS receivers.
The Garmin units get tuning instructions from the GPS keyboard (which are not on the
boards). To receive DGPS signals, you'll need a tunable beacon receiver. Correction
signals are sent in through the data in cable (just like the handhelds).
- Will the documentation include full description of the proprietary protocol?
The data on their "proprietary" command protocol is included. Here "proprietary" means a "non-standard" NMEA command. They start with $PG instead of $GP...
- Will there be a 1 Hz output?
Yes, there is a 1pps signal at no extra charge!
- Does Garmin have a web page?
- It appears the GPS-25 does NOT have a built-in display but one has to use an
external computer with unspecified software. Also the external computer is required
to provide tuning instructions. Is this correct?
This is just the GPS engine that produces NMEA outputs. No display, no user functions...