Off the back of https://www.geekzone.co.nz/forums.asp?forumid=85&topicid=223150  I'll open this for looking at new trackers.

I currently have  GPS103b that goes into GPSGate using what they call the Xexun protocol.

Which looks like this:

Client: ##,imei:123456789123456,A;
Client: imei:123456789123456,tracker,170916225204,,F,225204.000,A,4112.9668,S,17454.1571,E,25.51,326.61;
Client: imei:123456789123456,tracker,170916225219,,F,225219.000,A,4112.8803,S,17954.0847,E,25.85,327.67;

So obviously looking for replacements, if possible same protocol.

Will look at a couple and see if I can find one.  If you're interested, chime in.