Darkhorse - please read the manual + search function and You will find the answers:
reefmaster.com.au/reference/index.htm?contextid=10
bduss - do You mean, how i create a stepless zoomable raster as aerial photo outside Reefmaster?
(I would ever create the depth lines and the colored lake areas as vector overlay)
The only way i know for really high quality aerial photo raster are Global Mapper or ArcGIS.
Other GIS application can also create geotiff files, but i think not in such high resolution.
Do You have this programs?
For GM here You find a note:
reefmaster.com.au/index.php/forum/suppor...on-hds?start=12#3884
For ArcGIS i could give a small tip.
Important is the following figure:
The white areas symbolize an aerial (or other) background.
All geotiff files (or other geo formats) will be proceeded together in the IMC raster mode.