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GARMIN
GBR 21
DGPS corrections are accepted in RTCM-104 v. 2.0
format through the NMEA In (BROWN) harness lead.
The GARMIN GBR 21 is the recommended beacon
receiver for use with the GPSMAP 135 system. Other
receivers with the correct RTCM format may be used,
but may not correctly display status or allow tuning
control from the sounder unit.
Installing the Ferrite Clamps
In order to filter Radio Frequency Interference (RFI) radiation which would
possibly interfere with items such as televisions, radios, or other depth sounders
which are operating in close proximity to the GPSMAP 135 Sounder, two ferrite
bead filter clamps are included for attachment to the unit’s cables. The clamps
attach to your transducer and power cables near the point at which they connect
to the back of your GPSMAP 135 Sounder.
To install the ferrite bead filter clamps:
1. Choose a location which is no more than two inches from the back of the
GPSMAP 135 Sounder.
2. Open each filter clamp by slightly pulling out on the latch and opening the filter
halves.
3. Position each clamp and squeeze it shut around the cable until the latch is secure-
ly fastened.
The clamps should not need to be replaced under normal use.
If you have any questions or require replacement filter clamps, contact your
local GARMIN dealer.
SECTION
A
APPENDIX
Installation
GPS 135 Rev C 8/4/98 4:20 PM Page 85