In Japan, a new GPS is expensive. A Garmin Legend HCx (very popular with OSM users) on Amazon costs $196.79 (USD) in America, but ￥52,914 (JPY) in Japan. This is $578.93 (USD), almost 3 times the price! I will search for a better price.

Today I added a Lawson convenience store with Mapzen. I tried to add another store, but Mapzen crashed three times.

I walked the same road 6 times. The paths are very far apart, about 80 meters overall. All roads in the city are street canyons with tall buildings. Do you think that the satellite transmissions are bouncing on the buildings, confusing the GPS? Do you think that new GPS technology adjusts for this?

Thank you for your advice.

Waiting for the GPS to get more satellites worked well. Thank you for the advice. The GPS had more satellites, but the accuracy is not good. The track still is not straight. I walked the same street today two times, the tracks are very different. I made waypoints at every intersection. I waited at each intersection for a minute before making a waypoint. I watched the cursor slowly move as I waited. I will have to wait many times to add new streets.

Maybe the GPS is too old. I want to add new streets by walking with the GPS, or riding a bicycle. To wait at each intersection is too slow. Also, curving roads need more waiting.

Today I tried to use my GPS to map a new street. I'm using a very old Magellan Meridian Gold GPS. It has problems holding 3D mode. Walking down a straight road, a swerving track is created. The GPS is changing between 2D and 3D mode so accuracy is poor. Maybe the tall buildings along the street are occluding the satellites. Or maybe the problem is that I am moving when I turn on the GPS. Tomorrow I will turn on the GPS before I leave. I hope it can get more than 4 satellites.

Today I added an AMPM and Yoshinoya restaurant. Just playing around. I used Mapzen on my iPhone. This App cannot add new streets, so I will have to use my GPS for that.