Went for a ride today and realized I had not started the Garmin.
Is it possible to enter the trip data manually.

Did you want to manually input your average speed?

i did that once with a video camera.....so we had to sing happy birthday twice and i had my daughter blow out the candles again...

seriously...i dont think you can...what computer do you have...why do you need to enter the data...

I don't believe there is a way to put it into the Garmin computer...Garmin Connect on the otherhand allows you to manually enter the info..Took the bike the otherday to drop off some movies and on the way home took a 5 mile diversion, as I approached my main route I realized I had not restarted my 305 so I rode the 5 again...LoL...

You can ... but ... unless you know the same details of your ride, it won't really be the same. And, if you did know, then you wouldn't need the GPS in the first place.

Actually, you can. The computers store their data in different formats, and most of them let you upload trips to navigate from, plus just act as mass storage devices. So, you can put fake data into it ... but, again, it's bound to disappoint.

The GPS data stream is really just a collection of points with your latitude, longitude, the time and date you passed through that spot, and other data like your heart rate, cadence, power output, etc. You can guess, but then you don't get bragging rights for the ride data that way.

I don't think so.

I have occasionally forgotten to hit 'start' again after a rest, only to realise at my next stop.

Once I download the Garmin to the computer, I can easily see the gap in the ride data (usually an obvious straight line on the map joining the ends of the recorded zones). If I am on an 'out and back' route it is possible to work out how far the gap was (going between same points on the return leg when I remembered to hit start), so I manually enter the extra distance in the overall total by editing the activity (I'm using the Ascent software, but I think this still works for the Garmin Training Center). I can also add extra time etc as well to keep the averages looking legit.

It keeps the monthly log looking good.

No. Just do the ride again.

However, if the ride is in training center you could take a similar/duplicate ride & export a tcx file. Edit the tcx file to change the dates & then import the edited data. This wouldn't be too hard, but would require changing lots of dates via search & replace. Changing anything other than the date would be very tricky.

The same approach should work for other programs as long as you can get an xml file or some other format you can edit.

@JonnyHK Auto Pause is your friend I start my Garmin when I'm standing over the bike at the start, let it auto-pause for any breaks I take, and stop it when I'm really done. (I'm guessing you know this already, but just thought I'd throw it in). As far as the original question, if it's regarding Garmin Training Center, I don't think there is a way to put the data in manually. As mentioned above, though, if using something like Garmin Connect or MapMyRide you can put in as much data as you can figure out so it's in your training log.

Thanks all. I entered the info into Garmin connect.

I have my start notice set to go off every 30 seconds for this very reason. When it detects movement it will beep plus tell you on the display. I don't know if all Garmins have this feature, I'm using the Edge 500.

I have the edge 500 also. Will give that a try.