peacefulbliss
New Member
Garmin and time to arrive
Hi all,
Just wondering what the general opinion is of the way Garmin calculates the time to arrive on the GPSMAP 551 (and i guess on all their marine chartplotters)
Seems it uses the GPS speed rather than the VMG which seems nonsense to me. Was travelling away from the next waypoint on a route at the weekend, VMG was -4kts and time to arrive was still reading 1 hour which I thought was very good for a circumnavigation!!
I know that in a yacht I will be tacking and changing my direction/speed regularly but that is what VMG is for and time to arrive should change accordingly.
Called their support and they weren't particularly helpful and didn't really come with a persuasive argument. Surely this is basic navigation theory when calculating a ETA?
Hi all,
Just wondering what the general opinion is of the way Garmin calculates the time to arrive on the GPSMAP 551 (and i guess on all their marine chartplotters)
Seems it uses the GPS speed rather than the VMG which seems nonsense to me. Was travelling away from the next waypoint on a route at the weekend, VMG was -4kts and time to arrive was still reading 1 hour which I thought was very good for a circumnavigation!!
I know that in a yacht I will be tacking and changing my direction/speed regularly but that is what VMG is for and time to arrive should change accordingly.
Called their support and they weren't particularly helpful and didn't really come with a persuasive argument. Surely this is basic navigation theory when calculating a ETA?
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