seattleboatguy
Senior Member
I was watching the AIS target of a ferry boat pass by yesterday on my Gatmin 741 chartplotter, and started wondering about Closest Point of Approach (CPA). Do the commercial ships have some sort of computer display that says "Your CPA will be 2.7 miles in 3 minutes 21 seconds", or do they still need to plot that stuff by hand?
It would seem like my Garmin 741 has enough data to do that kind of calculation for AIS targets, but I'm not sure if it actually does it. I do sometimes see a dotted line to a ship wreck symbol. Could that be a CPA?
It would seem like my Garmin 741 has enough data to do that kind of calculation for AIS targets, but I'm not sure if it actually does it. I do sometimes see a dotted line to a ship wreck symbol. Could that be a CPA?