LogYourRun	RunKeeper	MapMyRun	Nike+ GPS	Jog Log	Runtastic	Runmeter
GPS
Live updates	Via Twitter TweetMyDistcance	RunKeeper Live
Route view
In App Elevation	Google					GPS	GPS
Pedometer
Music							change tracks
Heart rate	fisica, 60beat, voice cues	fisica	fisica	Nike+ system	fisica	fisica, 60beat, voice cues
Time in zones
Voice cues
Facebook upload
Twitter upload
Dailymile upload
Email sharing
Manual entry
Integrated website
Other types of activities			other apps
See routes in your area
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Legend

	Feature available in free and paid version
	Feature not available
	Feature available in paid version only

Luckily most of the leg work in this are has been done by Matt Gemmell and his Twitter engine. Some slight modifications are required in order to get it running on the iPhone and working with OAuth.  Update:  The guys at iCodeBlog have a great tutorial on how to implement the libraries.

With these libraries dropped in the new Twitter authentication system is fairly easy to implement. The main problem is that the MGTwitterEngine does not support the Twitter location API. Since this is an important piece of TweetMyDistance I modified the MGTwitterEngine.m and added a function for tweeting with location. The new method takes latitude and longitude as well as the tweet and if this is a reply to a previous tweet. As you can see from my tweet it works great. The code below should replace the code in MGTwitterEngine and don’t forget to also update your .h file.

- (NSString *)sendUpdate:(NSString *)status
{
    return [self sendUpdate:status inReplyTo:0];
}

- (NSString *)sendUpdate:(NSString *)status inReplyTo:(unsigned long)updateID
{

	return [self sendUpdate: status inReplyTo: updateID withLatitude: 0.0 andLongitude: 0.0];

}

- (NSString *)sendUpdate:(NSString *)status
			   inReplyTo:(unsigned long)updateID
			withLatitude:(double) lat
			andLongitude: (double) lng
{
	if (!status) {
        return nil;
    }

    NSString *path = [NSString stringWithFormat:@"statuses/update.%@", API_FORMAT];

    NSString *trimmedText = status;
    if ([trimmedText length] > MAX_MESSAGE_LENGTH) {
        trimmedText = [trimmedText substringToIndex:MAX_MESSAGE_LENGTH];
    }

    NSMutableDictionary *params = [NSMutableDictionary dictionaryWithCapacity:0];
    [params setObject:trimmedText forKey:@"status"];
    if (updateID > 0) {
        [params setObject:[NSString stringWithFormat:@"%u", updateID] forKey:@"in_reply_to_status_id"];
    }
    if (lat != 0.0 && lng != 0.0) {
		// lat=%1.6f&long=%1.6f&display_coordinates=true
        [params setObject:[NSString stringWithFormat:@"%1.6f", lat] forKey:@"lat"];
        [params setObject:[NSString stringWithFormat:@"%1.6f", lng] forKey:@"long"];
        [params setObject:@"true" forKey:@"display_coordinates"];
    }
    NSString *body = [self _queryStringWithBase:nil parameters:params prefixed:NO];

	DLog(@" twitterbody: %@", body);

    return [self _sendRequestWithMethod:HTTP_POST_METHOD path:path
                        queryParameters:params body:body
                            requestType:MGTwitterUpdateSendRequest
                           responseType:MGTwitterStatus];
}

So I looked around for other places to get elevation data.  Turns out that the space station has used lasers to measure elevation all over the surface of the earth and that Google has an API which allows you to query that data.  This means much better resolution on the elevation data than a GPS (even a garmin) could ever provide and I can show elevation data for both current routes as well as routes that have been saved which have no elevation data saved with them.  The only issue is that a data connection is required in order to get at this data but the amount of data being sent back and forth is so small that the elevation data shows up almost instantly even on an EDGE connection.  Being a good citizen I only have the app request elevation data if the user is interested in seeing this type of data – this keeps data usage down and keeps load off Google’s servers.

The video below shows how the elevation data is displayed within the app.