Two angles from the shore
Intersecting ranges
Two angles from the boat
Cross rope
Reduced sounding
Elevation
Datum surface
Bench mark
Low water ocean spring tides
Low water optimum spring tides
Low water opposing spring tides
Low water ordinary spring tides
Minidrafter
Junior drafter
Station pointer
Plotting scale
Mean Low Water Springs
Maximum Level of Water Spring
Mean Level of Water Springs
Mean Level of Water surface