1. Displaying WAYPOINT ······················································································71
2. Erasing WAYPOINT···························································································71
3.6
Use of Function Keys ···········································································································75
3.6.1
Overview··················································································································75
3.6.2
Operation procedures ·····························································································76
1. Calling a function································································································76
3.7
Other Procedures Required ·································································································79
3.7.1
3.7.2
3.7.3
3.7.4
3.7.5
3.7.6
3.7.7
3.7.8
3.7.9
3.8
Options ·································································································································85
3.8.1
4.1
Distance and Target ································································································87
4.2
Returns from a Target···········································································································88
4.3
4.3.1
Sea returns ··············································································································89
4.3.2
False echoes ···········································································································89
4.4
5.1
General Maintenance···········································································································92
XVI