tawcat
New Member
Bill,
Are you referring to an antenna that looks like this:
If it is, it's not the same.
Nope! My antenna looks like this.
Raymarine RN300 GPS losing fix
- Thread starter CJ Martin
- Start date
Nope! My antenna looks like this.
Exactly! I think Bill is giving advice on a different antenna/GPS unit....
tawcat
New Member
Thanks Gary!!!
- Nov 12, 2006
- 5,334
- Boat Info
- 1999 Sea Ray 330DA
Twin 7.4 MPI (310 propshaft HP) V-drives
- Engines
- Twin Mercury Marine marinized 7.4L L-29 V8s
Cast iron block w 4-bolt mains
Gary had this right in his first post.
The Raystar 112 GPS sensor and it's differential GPS twin the 114 were NMEA out, or SeaTalk out devices and had batteries internal to the case to maintain the unit's position memory. The older Raystar 308 also was NMEA out with an internal battery. The 112/114 tracked up to 12 satellites. The older 308 tracked up to 8. The later GPS 120, 125 are similar devices but decode WAAS data to correct the basic GPS position data. Again, since they do the GPS/WAAS decoding internally, they have a processor, memory and a battery.
The Raynav 298/398 units were combination Loran and GPS units. They could also accept a differential GPS signal as well as Loran. GPS was external to the unit. They required a GPS 108 or equivalent to operate in GPS mode. They needed a loran whip antenna and amplifier to operate in Loran mode.
The Raychart 300, 320, 420, 425, etc all used GPS antennas mounted to the radar arch. Since they were simple antennas with low noise amplifiers, they do not have memory and therefore do not need a battery to maintain that memory.
Best regards,
Frank
BTW, the Raynav 398 sucks.
The Raystar 112 GPS sensor and it's differential GPS twin the 114 were NMEA out, or SeaTalk out devices and had batteries internal to the case to maintain the unit's position memory. The older Raystar 308 also was NMEA out with an internal battery. The 112/114 tracked up to 12 satellites. The older 308 tracked up to 8. The later GPS 120, 125 are similar devices but decode WAAS data to correct the basic GPS position data. Again, since they do the GPS/WAAS decoding internally, they have a processor, memory and a battery.
The Raynav 298/398 units were combination Loran and GPS units. They could also accept a differential GPS signal as well as Loran. GPS was external to the unit. They required a GPS 108 or equivalent to operate in GPS mode. They needed a loran whip antenna and amplifier to operate in Loran mode.
The Raychart 300, 320, 420, 425, etc all used GPS antennas mounted to the radar arch. Since they were simple antennas with low noise amplifiers, they do not have memory and therefore do not need a battery to maintain that memory.
Best regards,
Frank
BTW, the Raynav 398 sucks.
