With the help of a ShipPlotter user in Finland we have been able to run side by side tests of our Pocket Mariner Dual Channel AIS receiver with a mainstream commercial brand AIS receiver costing over 3 times the price. We are very pleased with the results, with the Pocket Mariner Dual Channel AIS receiver achieving almost exactly the same coverage/range/data rate of the well known commercial brand. Here are some stats comparing our Pocket Mariner AIS receiver on port 7018 (blue) and the other on port 5378 (red ) and screenshots at the same time of the coverage from the same aerial in Helsinki.
Rate of data received (bits/s)
We also found that the coverage/range for both the commercial AIS receiver and ours was significantly improved using a relatively in-expensive AIS frequency (162MHz) tuned filter and pre-amp on the aerial feed. We used and would recommend the VHF Pre-amp from Spectrum Communications (formerly known as the Garex pre-amp). They start at around £15 for the pcb built one and around £50 for a boxed version. The ship ranges in the screenshots below is approximately 150km (100Miles). The tropospheric conditions were good.
7018 Pocket Mariner Dual Channel AIS Receiver coverage snapshot
5378 Commercial AIS Receiver coverage snapshot
N.B. The buoys at the top of the screen (North) are over 350km away and most likely Synthetic Aids To Navigation being broadcast by a shore based station nearer our aerial.
If you are interested in having a Pocket Mariner Dual Channel AIS receiver please get in touch with us at . firstname.lastname@example.org