Memorex RX 1 Smart Installationshandbuch PDF herunterladen (Seite 225)

224 | Simrad MX500

properly reset. If it does not, try the procedure

again.

A common source of memory corruption is an aged

Lithium memory back-up battery. This will result in ei-

ther a slow deterioration of memory retention or it may

abruptly dump all its memory.

SIMRAD recommends the battery be changed every 2 to

3 years of operation by an authorized technical dealer.

Marine electronics dealers or radio shops will typically

stock the replacement battery, Lithium type TL-5902,

3.6V (1/2 AA).

GPS - GPS CDU Troubleshooting

GPS3 - Visible Satellite Information

This screen provides some basic information about the

MX smart GPS antenna performance, in that it is basi-

cally an extension of GPS1 screen. It tells you what

satellites are available to track at the moment under the

PRN number. The signal strength of satellites under track

is in the second column labeled S/N. The weakest signal

strength that the GPS receiver can track is 25. However,

any satellite with a signal strength under 32 is considered

troubled, and the GPS receiver will not use that satel-

lite in the navigation solution. Troubled satellites tend to

cause position jumps and greatly reduce the accuracy of

the GPS position fix.

The EL, AZ, and STA values represent the satellite’s

Elevation and Azimuth, and Almanac Status respectively.

Low signal to noise (S/N) quality numbers may be an

indication of local interference from on-board electronic

equipment such as Radar, INMARSAT, VHF, SSB and

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Memorex RX 1 Smart Installationshandbuch Seite 225