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5-1
5. ARPA ARP-26 (Option for NM-type radar)
5.1 General
This 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.
Note: ARP-26 is not available with statute mile (SM)-type radar.
5.1.2 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 prior-
ity 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). Manu-
ally acquired targets are indicated in bold symbols and the automatically acquired tar-
gets, in thinner symbols.
Vector length: 0.5, 1, 2, 3, 6, 12, 15, 30 minutes
Orientation: True velocity or relative velocity
Stabilization: Sea or Ground as selected with the [VECTOR] key.
Motion trend: Displayed within 20 scans, full accuracy within 60 scans after acquisi-
tion.
Past positions: Choice of 5, 10 or 20 past positions at intervals of 30 seconds, 1, 2, 3 or
6 minutes.
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 after selected delay (1-60 minutes).