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Chapter 4.6.5 of the style manual shwos a table with road speeds and
its corresponding "highest speeds". <br>
I created a small test map with roads of ca. 100 km length of all 5
road_types and added speed limits which translate into the 8
different road_speed codes with the current (v3310) default style.<br>
<br>
Following table shows my car navigation results on an Oregon 600
with current firmware (3.90):<br>
<table style="border-collapse: collapse;width:330pt" width="439"
border="0" cellpadding="0" cellspacing="0">
<colgroup><col
style="mso-width-source:userset;mso-width-alt:2779;width:57pt"
width="76"> <col style="width:60pt" span="2" width="80"> <col
style="mso-width-source:userset;mso-width-alt:3291;width:68pt"
width="90"> <col
style="mso-width-source:userset;mso-width-alt:4132;width:85pt"
width="113"> </colgroup><tbody>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt;width:57pt" width="76" height="20">Roadspeed</td>
<td style="width:60pt" width="80">Distance</td>
<td style="width:60pt" width="80">Time</td>
<td class="xl66" style="width:68pt" width="90">Speed</td>
<td style="width:85pt" width="113">Simulationspeed</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">7</td>
<td align="right">99,9</td>
<td class="xl67" align="right">00:53:27</td>
<td class="xl66" align="right">112,14</td>
<td align="right">254</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">6</td>
<td align="right">99,7</td>
<td class="xl67" align="right">00:56:41</td>
<td class="xl66" align="right">105,53</td>
<td align="right">130</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">5</td>
<td align="right">100</td>
<td class="xl65" align="right">01:00</td>
<td class="xl66" align="right">100,00</td>
<td align="right">100</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">4</td>
<td align="right">99,5</td>
<td class="xl65" align="right">01:16</td>
<td class="xl66" align="right">78,55</td>
<td align="right">90</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">3</td>
<td align="right">100</td>
<td class="xl65" align="right">01:34</td>
<td class="xl66" align="right">63,83</td>
<td align="right">70</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">2</td>
<td align="right">99,9</td>
<td class="xl65" align="right">02:03</td>
<td class="xl66" align="right">48,73</td>
<td align="right">50</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">1</td>
<td align="right">99,6</td>
<td class="xl65" align="right">03:06</td>
<td class="xl66" align="right">32,13</td>
<td align="right">30</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">0</td>
<td align="right">100</td>
<td class="xl65" align="right">06:09</td>
<td class="xl66" align="right">16,26</td>
<td align="right">16</td>
</tr>
</tbody>
</table>
The "Speed" is calculated by dividing the distance to destination by
the time to destination; <br>
the "Simulationspeed" is the speed shown on the device when you
select the simulation option.<br>
The speeds do not depend on the road_type value.<br>
The speeds for classes 0, 1, 2, 3, and 7 are multiples of 10mph.<br>
When using a different routing type (e.g. pedestrian), the
simulation speed did not change (i.e. a pedestrian "walking" at 50
km/h...), but the calculated time to destination changed (i.e. a
pedestrian was doing ca 5 km/h, a cyclist ca. 25 km/h).<br>
<br>
With an Oregon 400 with old firmware (4.20), values are slightly
different:<br>
<table style="border-collapse: collapse;width:300pt" width="400"
border="0" cellpadding="0" cellspacing="0">
<colgroup><col style="width:60pt" span="5" width="80"> </colgroup><tbody>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt;width:60pt" width="80" height="20">Roadspeed</td>
<td style="width:60pt" width="80">Distance</td>
<td style="width:60pt" width="80">Time</td>
<td class="xl66" style="width:60pt" width="80">Speed</td>
<td style="width:60pt" width="80">Simulationspeed</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">7</td>
<td align="right">99,9</td>
<td class="xl67" align="right">00:45:20</td>
<td class="xl66" align="right">132,22</td>
<td align="right">129</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">6</td>
<td align="right">99,7</td>
<td class="xl67" align="right">00:51:51</td>
<td class="xl66" align="right">115,37</td>
<td align="right">113</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">5</td>
<td align="right">100</td>
<td class="xl65" align="right">00:56</td>
<td class="xl66" align="right">105,63</td>
<td align="right">103</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">4</td>
<td align="right">99,5</td>
<td class="xl65" align="right">01:07</td>
<td class="xl66" align="right">89,10</td>
<td align="right">87</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">3</td>
<td align="right">100</td>
<td class="xl65" align="right">01:32</td>
<td class="xl66" align="right">65,22</td>
<td align="right">64</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">2</td>
<td align="right">99,9</td>
<td class="xl65" align="right">02:03</td>
<td class="xl66" align="right">48,73</td>
<td align="right">48</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">1</td>
<td align="right">99,5</td>
<td class="xl65" align="right">03:06</td>
<td class="xl66" align="right">32,10</td>
<td align="right">32</td>
</tr>
<tr style="height:15.0pt" height="20">
<td style="height:15.0pt" align="right" height="20">0</td>
<td align="right">100</td>
<td class="xl65" align="right">10:16</td>
<td class="xl66" align="right">9,74</td>
<td align="right">9</td>
</tr>
</tbody>
</table>
The main difference is in faster speed for higher road_speed types,
but lower simulation speed.<br>
<br>
This means that Garmin uses different speeds for calculating the
time to destination between different device types!<br>
<br>
I hope this information helps the creators of maps, and helps to
clarify questions on why this route was taken instead of that...<br>
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