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ALE-GPR
Automatic Link Establishment
Geo Position Report
Standard-In-Progress
ALE-GPR Format for AMD
ALE-GPR Fields


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ALE-GPR Standard v1.1
A non-proprietary standard for Geographic Position Reporting via Automatic Link Establishment is supported by the amateur radio ALE community and various ALE controller systems. The standard is called ALE Geo Position Report or ALE-GPR. To make the ALE-GPR "universal" for ALE transceivers and controllers, the coordinates and other information of the GPR is converted to plain text and contained within an AMD message. 

Standard Use of Geo Position Report with NETCALL and AMD TWS:
Net name: GPR
Here is a *.wav file Netcall to the "GPR" Net address with the GPR in an AMD and TWS termination:
KQ6XA_GPR_TEST.wav

By using NETCALL for GPR, the receiving stations must "opt in" to the GPR Net rather than everyone else having to "opt out" in the case of a GPR as an ALLCALL. Individual stations can exchange GPRs using Individual Calls.

Here is an example of a series of two ALE-GPRs sent as Netcall AMD (TWS) by KQ6XA in California and received by Jeff KB2M in New Jersey, using PCALE on both ends of the path:
ALE GPR KQ6XA KB2M
image courtesy of Jeff KB2M
ALE-GPR String Format For AMD
Manual keypad entry of ALE-GPR limits the characters that can be used. It is important for ALE-GPR that the operator of the ALE transceiver, having knowledge of their own position, be able to manually enter the GPR as an AMD on the keypad of the ALE transceiver and send it. This manual entry method would not require the electronic connection of a GPS receiver to the HF transceiver or ALE controller, or modification of the ALE controller software/firmware. Displays on the front panels of some ALE transceivers use simple LCD readouts with about 10 to 20 characters displaying on a line. The AMD text is read by scrolling left/right with an arrow key on the keypad. There are limitations on what characters read out on ALE transceivers. The following characters are common to all ALE displays and most transceiver keypads:
ABCDEFGHIJKLMNOPQRSTUVWXYZ 0123456789 SPACE
* #
Any other character sent in the AMD has a risk that it might not show on the display.

A proposal has been made for a simplified format for the ALE-GPR with only 7 fields; using the * character as a de-limiter:

Example:
GPR*KQ6XA*37N654321*122W987654*000003M*20050821Z135235*EVERYTHING FINE

Proposed string field format ALE-GPR:
GPR*OBJECT*LAxTITUDE*LONyGITUDE*ALTITUDf*YYYYMMDDZhhmmss*COMMENT

Proposed ALE-GPR Fields
Field
Position
Field
Name
Characters
Description
Format Example
1
GPR 3
"GPR" preamble to signify Geo Position Report follows. Since it is only 3 characters,  it becomes part of the [CMD AMD] command word in the ALE protocol.
GPR
2
OBJECT 3 to 15
Object being reported. Normally this is your Callsign or Own ALE Address. It could alternatively be the name or callsign of another object being reported (or relayed). Use of the # character in this field indicates the slant bar / commonly used in callsigns.
ABCDE0123456789
(reporting an object with the name ABCDE0123456789)
3
LATITUDE up to 9
Degrees and decimal degrees; with decimal point replaced by N or S for North or South. If this field is stuffed, mimumum field characters are 2 digits of degrees followed by the separator. The presence of the # character in any part of the latitude field indicates a manual entry or a non-valid position in the GPS receiver. 37N654321
(Latitude 37.654321 degrees North)
4
LONGITUDE up to 10
Degrees and decimal degrees; with decimal point replaced by E or W for East or West. If this field is stuffed, minimum field characters are 3 digits of degrees followed by the separator. The presence of the # character in any part of the longitude field indicates a manual entry or a non-valid position in the GPS receiver. 122W987654
(Longitude 122.987654 degrees West)
5
ALTITUDE up to 7
Altitude; with suffix M for meters or F for feet. Minimum field character is 1 digit for altitude plus the suffix. The presence of the # character in any part of the altitude field indicates a manual entry or a non-valid position in the GPS receiver. 0000003M
or
3M
(Altitude 3 meters)
6
YYYYMMDDZhhmmss 15
DATE-TIME Stamp.
Year,Month,Day,Hour,Minute, Second; With "A-Z" as the timezone separator between date and time.
Z=UTC (zulu)
J=Local Time, etc.
Time Zone Separator Chart
The presence of the # character in any part of the time field indicates a manual entry or a non-valid position in the GPS receiver.
20050821Z135235
(2005 August 21 at 13hours 52minutes 25seconds UTC zulu)
7
COMMENT up to 25
Text comments up to 25 characters, spaces permitted;  and/or Un-defined fields.
EVERYTHING FINE HERE NOW
(25 characters of text with spaces between words if needed)
All fields are de-limited by a single * character between fields, with no de-limiter at the beginning or end.
Any character except  * in fields 2 through 7  may be replaced by the # character as a spacer or null entry, or for other purposes. The presence of the # character in any part of the latitude, longitude, altitude, or time fields indicates a manual entry or a non-valid position in the GPS receiver.

Typical Embedded-ALE Transceiver Displays and Keypads targeted for ALE-GPR compatibility:
PRC138 Linked with KQ6XA
PRC138 ALE Transceiver
Micom3 ALE Transceiver
IC-F7000

Harris ALE Controller 7210a

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