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Chapter 2 OPERATION OF ARPA (Option)
2.1 General
The FR-2105 series radar can accommodate an ARPA (Automatic Radar Plotting Aid)
module ARP-26 complying with IMO A.823 and IEC 60987-1. This chapter describes the
operation of the ARPA. For operation of normal radar, refer to Chapter 1.
Principal specifications
Acquisition and tracking
• Automatic acquisition of up to 20 targets plus manual acquisition of 10 targets, or fully
manual acquisition of 30 targets between 0.2 and 32 nm. Manual acquisition has a priority
over automatic acquisition. Therefore, if 20 targets have been manually acquired, the
capacity for automatic acquisition is 10 targets.
• The ARPA automatically tracks all acquired targets, whether manually or automatically
acquired, between 0.1 and 32 nm (0.1 and 24 nm depending on initial setting). Manually
acquired targets are indicated in bold symbols and the automatically acquired targets, in
thinner symbols.
Vector length: 0.5, 1, 2, 3, 6, 12, 15, 30 min.
Orientation: True velocity or relative velocity
Stabilization: Sea or Ground as selected with Vector key.
Motion trend: Displayed within 20 scans, full accuracy within 60 scans after acquisition.
Past positions: Choice of 5, 10 or 20 past positions at intervals of 30 s, 1, 2, 3 or 6 min.
Alarms: Visual and audible alarms against targets violating CPA/TCPA limits, lost
targets, targets crossing guard zone, system failure and target full status.
Trial maneuver: Predicted situation appears in 1 min after selected delay (1-60 minutes).