The map shows different depths and if there is a change from deep to shallow then back to deep most times reef will be in these areas. With the map we have found many new fishing spots. what if your mates dont have any spots or you would like to find new fishing grounds. The Blue map is very accurate with all map details. ![]() A must have item when traveling those areas. Without the Blue map we would have got lost its a maze and you can not see these reefs until your right on top and it can get very shallow instantly. The reefs out there are huge and submerged. You say (as for relying on the map data i don't know why you would want to! reefs you will get from mates and find yourself) Damon a few months ago we did a trip to the reefs out from Hinchinbrook Island. ![]() It saves time when sounding around and also makes it easier for navigating. We all use sounders to see water depths but being able to know and see all contours on the GPS makes things a hell of alot better. also the chart plotter is super for being able to retrace your steps, say thru a bar at night! and as for relying on the map data i don't know why you would want to! reefs you will get from mates and find yourself the cmap tends to make land masses and shallows a little larger then they r for safety sake but if you aren't navigating from waypoint to waypoint of mark that you put on the chart and know to be correct i would certainly be making sure its done in daylight- i "fly by wire" at night (i keep watch for vessels!) and i have never had a problem using my own waypoint which i gather during the day preferablily at low tide ie i have the waypoints thru the rous channel so i dont have to be seeing a beacon with a busted light next to me in the cabin!Ībove all that i would make sure i was proficent at navigating with compass and charts first any how- i should know i won the bsfc "navigation" award 2003 - for great navigational ability under extreme circumstances! as for bottom contours i use the sounder to get a proper idea of water depth. I'm with phill on the split screen thingy its hard enought to see a 6" screen let alone making it 3".
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