Using a GPS mouse as primary or backup GPS with the Brookhouse NMEA
In combination with
the automatic backup switching feature of the brookhouse mux, this is a
great way of ensuring uninterrupted lat/lon fixes in case the primary
GPS fails, at very affordable cost.
A GPS mouse is a small, selfcontained GPS receiver incl. antenna, without
any switches, buttons or display. It has a fixed cable, for output of
GPS NMEA sentences. The same cable is used to supply power. This type of
compact GPS is
designed primarily for use with a laptop or PDA.
The problem with this type of GPS in marine navigation systems is that they receive their power (5V) via the same cable as they output NMEA data. It is therefore not possible to simply cut off the connector and insert the wires in the NMEA IN terminals of a multiplexer or other NMEA listener. The extra 5V power supply made the use of these wonderful small and affordable GPS units often impractical in integrated marine navigation systems.
The Brookhouse NMEA multiplexer can now be supplied with a female
mini-Din connector which allows the PS2 GPS to be directly plugged
in. The multiplexer supplies the required 5V power via this connector.
The GPS is internally connected to NMEA input port 3 of the multiplexer. The user can decide if the GPS mouse will be used as a backup GPS, by activation of the automatic backup switching feature in the setup menu, or as the primary GPS.
This provides a tidy and very affordable GPS solution.
The standard connector does not need to be cut off, no adapter cable is
required, power supply is taken care of by the multiplexer. If a
multiplexer with LCD is used, the lat/lon and other GPS data can be
displayed, also if no computer is connected.
aware that not all pin-outs for PS2 GPSs are the same. We use
pinout as for the Haicom Hi-204III, see picture above. A connector with
different pin-out can be supplied. As the connector is internally wired to mux
NMEA input port 3, no other NMEA talker should be connected
to this port. But a listener that only requires GPS data, such as a
DSC radio, may be connected to input port 3 to share the GPS output
with the multiplexer.