Thread: Questions, and I can't get answers

As far as the Lowrance products, the Point1 is the only L2 or Glonass receiver.

Some real world clear sky EPE data:

HDS Internal: 30-40ft. (~10ft accuracy)

LGC-4000: 20-30ft (~6-8ft accuracy)

Point 1: 8-18ft (almost dead on)

My guess is any receiver that used L2 would feature it in their advertising somewhere.

The GPS Receivers that Humminbird uses are for the L1 frequency only.

Originally Posted by Humminbird_Greg

The GPS Receivers that Humminbird uses are for the L1 frequency only.

Little more information for you CP:
We only use the L1, C/A code, 1.575 GHz frequency, not the L1 C/A code, 1.602 GHz frequency.

Thanks all.

Each GPS satellite transmits signals on two frequencies: L1 (1575.42 MHz) and L2 (1227.60 MHz). The L1 frequency contains the civilian Coarse Acquisition (C/A) Code as well as the military Precise (P) Code. The L2 frequency contains only the P code. The P code is encrypted by the military—using a technique known as anti-spoofing—and is only available to authorized personnel. The encrypted P code is referred to as the Y Code. Civilian GPS receivers use the C/A Code on the L1 frequency to compute positions—although high-end survey grade civilian receivers use the L1 and L2 frequencies’ carrier waves directly. Military GPS receivers use the P (Y) Code on both L1 and L2 frequencies to compute positions.

New GPS satellites also transmit on the L5 (1176.45 MHz) frequency. However it will be some time before there are sufficient GPS satellites transmitting the L5 frequency and before there are readily available GPS receivers that are capable of receiving the L5 frequency.

You understand all this stuff there Kosmo? You know what a carrier is? I believer the P is just heavy duty encryption for MilSpecs. Nothing to do with accuracy.

For some reason, the L2 frequencies you (Kosmo) posted don't match what Greg Posted?

Lowrance L1/L2 : Same as Greg posted

Type L1, C/A code, 1.575 GHz Frequency/ L2 C/A code, 1.602 GHz Frequency