This is how I do it, might help.
OUTBOUND
The first thing to do at start of mission is auto plot canal course.
Then zoom in to last waypoint and mark it.
I do this, even if I don't use the canal on outbound journey. May want to return that way.
Now remember not to use "erase all marks" in the mission, or you will lose it.
INBOUND
Plot your return course, your last plot should be on the mark. The previous waypoint to this should be due West.
If a maneuver is done just before these marks, then put in plots with lesser deviations to arrive at a 90 degree East direction.
On approach go to last waypoint and press "Canal Auto Plot" BEFORE last waypoint (Don't get too close to last waypoint, as unexpected directions will occur).
.................................................. ........... X..........................O...... X
..................................... ..X
. ......................... .X
.
.................... X
.
.
.
. ............ X
.
.
.
............. X
X = Last waypoint and mark. (where autoplot starts)
X = Due west from X.
O = Press "Canal Auto Plot" when here.
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